UPDATE:
I’ve found a workaround for this, if anyone else is interested:
In the sidebar widget for Collapsing Categories, be sure to include “Uncategorized” in the bottom of the options where it says:
Exclude these categories (separated by commas):
TIP: If you’ve been publishing any posts that don’t have a category (i.e. ‘Uncategorized’), be sure to add them to a different category, or create a new one.
Oh, I also took a look at the CollapsCat.php file, and it’s apparently turned off:
add_option( ‘collapsCatShowPages’, ‘no’ );
Yes, it’s fixed in the new version (using WP v2.5). Thanks a ton, it’s a great widget/plugin!