The only modules I have installed are: DOM, UserDefinedForms, Uploadify plus the standard SS installation.
I don't have any custom JS in the CMS. Just using some DOM and HasManyComplexTableField instances here and there.
Some more insight... I removed the line like you suggested and reloaded the CMS. Surprise, no problem this time. However I was logged in already.. maybe this issue only surfaces when you're logging in. Also, I didn't see an assets/_combined_files/ folder... this tells me it's probably not being generated.
Yeah I was looking in the file system to begin with.
I set the assets folder perms to 777 and still don't see the _combinedfiles folder. Perhaps I need to create it and set perms on it first?
Another insight... I don't get hit with the loading hang anymore, even when I log out and then back into the admin.