Package filtering broken

Latest dev works fine for me Bálint. Are you sure there's nothing else the matter? Perhaps you might wanna check these out:

#1170388: D7 version does not activate Modules / conflicts with Overlay JS
#1166414: module filter + tabs disabled = broken modules page

No problem mate ;)

There was an issue with the package tabs not working, but a followup commit had fixed this rather promptly. Probably why it worked for @klonos, he no doubt got the dev with the fix. :)

http://drupalcode.org/project/module_filter.git/commit/faa090e8af5903575...

I am building a new site; was using the 7.1.x version but was having the same symptoms as noted above -"clicking on package names on the left, still shows all the modules."

So, following the advice of this thread, I uninstalled the 7.1.x version and installed the 7.x-2.x dev version and then ran the update script. However, though the modules are grouped appropriately in the center of the page, now the package names on the left don't show at all. My left margin is blank except for the "Save" button.

Any ideas that could help. Otherwise I love what this module brings to the table. Thank you for your hard work.

Sounds like there's a JavaScript error. If you can determine what JavaScript error is being thrown, it could be helpful.