Drupal 7 version

subscribing and I could help u testing it as well

I'm attaching an improved collapsiblock.js file. This one works.

Changes include:

In D7, all your js must be wrapped inside

(function($) {
  ...
}

And behaviors are set like this:

Drupal.behaviors.collapsiblock = { 
  attach: function(context) {
     ...
  }
};

Then finally in collapsiblock.module we save on submit:

$settings['block-' . $form_state['values']['module'] . '-' . $form_state['values']['delta']] = $form_state['values']['collapse_type'];

This doesn't work, because values can_be_like_this_with_underscores, while the CSS classes allways-have-hyphens. So the jQuery selectord fails to find its targets.

Solution in collapsiblock.module, do a str_replace:

$settings['block-' . str_replace('_', '-', $form_state['values']['module']) . '-' . str_replace('_', '-', $form_state['values']['delta']]) = $form_state['values']['collapse_type'];

(This is needed in more than one place!)

Then we need to add a check to remove an unwanted PHP notice error:

    if (isset($settings['block-' . str_replace('_', '-', $form['module']['#value']) . '-' . str_replace('_', '-', $form['delta']['#value'])])) {
      $default_value = $settings['block-' . str_replace('_', '-', $form['module']['#value']) . '-' . str_replace('_', '-', $form['delta']['#value'])] ? $settings['block-' . str_replace('_', '-', $form['module']['#value']) . '-' . str_replace('_', '-', $form['delta']['#value'])] : variable_get('collapsiblock_default_state', 1); 
    } else {
      $default_value = 1;
    }
    $form['collapsiblock']['collapse_type'] = array(
    	'#type' => 'radios',
    	'#title' => t('Block collapse behavior'),
    	'#options' => array(1 => t('None.'), 2 => t('Collapsible, expanded by default.'), 3 => t('Collapsible, collapsed by default.'), 4 => t('Collapsible, collapsed all the time.')),
    	'#default_value' => $default_value,
    );

And finally, after it works 1x, there is an error in the javscript cookie, parseJson function does not exist.
It should be:

  return cookieString ? $.parseJson(cookieString) : {};

$.parseJSON instead of Drupal.parseJson.

Now it works again in D7. Full improved package attached. I dont know yet how to work with GIT; so couldnt make a patch.

There is one more error though, a conflict with Google Analytics code. Can'T figure that out.

Patches attached.