im_settings.js uses the selector 'input[@name=im_text_entry_type]'. The @ in attribute selectors is unnecessary in later versions of JQuery 1.1.x, deprecated in JQuery 1.2.x (which all Drupal 6 versions use) and breaks in JQuery 1.3 (which is provided by JQuery Update and is needed for some other modules and effects).

The quick fix is to simply remove the "@" from line 11 of im_settings.js -- this fix should be backwards compatible for all versions of D6.

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jvieille’s picture

jvieille CreditAttribution: jvieille commented
Issue summary: View changes

Thanks!
This bug prevents collapible fieldset to work properly
Needs clearing all caches for the change to take effect.