Yes, that loads fine as well. As I wrote before, the issue only happens when the URL contains a subdirectory, for example with
http://forums.finalgear.com/usercp/. Then the @import url("clientscript/vbulletin_css/style-86706997-00010.css"); is trying to load
http://forums.finalgear.com/usercp/clientscript/vbulletin_css/style-86706997-00010.css - which does not exist
adding one tiny slash there would make me a happy man.
PS: Here's a cap to illustrate my problem: http://img35.imageshack.**/img35/2623/usercp.png
You can see I'm loading the usercp, everything is taken from cache except for the CSS - URL /usercp/bla.css - and it fails.