block.module makes an error on user/*/edit

since the last block update there is an error on my site.
on a site like user/1/edit
in "Block configuration"
every Block with the setting "Hide this block by default but let individual users show it."
gets not only one checkbox for it there are around 20 now.
They are all identically

here is an example output:

<fieldset><legend>Block configuration</legend><input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">
 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>

</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">
 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>
</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">
 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>
</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">

 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>
</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">
 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>
</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">
 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>

</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">
 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>
</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">
 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>
</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">

 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>
</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">
 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>
</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">
 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>

</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">
 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>
</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">
 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>
</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">

 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>
</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">
 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>
</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">
 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>

</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">
 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>
</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">
 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>
</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">

 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>
</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">
 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>
</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">
 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>

</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">
 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>
</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">
 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>
</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">

 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>
</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">
 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>
</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">
 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>

</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">
 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>
</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">
 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>
</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">

 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>
</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">
 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>
</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">
 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>

</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">
 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>
</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">
 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>
</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">

 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>
</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">
 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>
</div>
<input type="hidden" name="form_zero[block][user][1]" value="1" />
<div class="form-item">
 <label class="option"><input type="checkbox" class="form-checkbox" name="edit[block][user][1]" id="edit-block-user-1" value="1" checked="checked" /> Navigation</label>

</div>
</fieldset>