Problem in CSS in Internet Explorer

Hello,

In my site I have a blok that comes from Views module. View name is 'adv'
I want to change the design for each node in that block - instead of having rounded corners box around the blok I what to have rounded corners box arount each node in the block.
So I created node-view-adv.tpl.php and put next code there:

<div class="Block">
  <div class="Block-tl"></div>
  <div class="Block-tr"></div>
  <div class="Block-bl"></div>
  <div class="Block-br"></div>
  <div class="Block-tc"></div>
  <div class="Block-bc"></div>
  <div class="Block-cl"></div>
  <div class="Block-cr"></div>
  <div class="Block-cc"></div>
  <div class="Block-body">
    <div class="BlockContent">
      <div class="BlockContent-body">
        <?php echo $content; ?>
      </div>
    </div>
  </div>
</div>

also I created file block-views.tpl.php with next code in it:

<?php echo $block->content;?>

Everything is fine in FF an Chrome.
In Internet Explorer the content that comes from this new template just blinks and then disappears. This happens every time on Ctr+F5. On F5 only it is OK for 3-4 times and then again disappears.

You can see it at http://parvanova.com/ani - the block I'm talking about is in the left sidebar on the first page only.

(At the bottom of the first page there is one more block also modifyed the same way and with the same problem)

Please advise what to do!
Thanks