Old theme showing up on random pages for some users

[mathforum]

Hi all,

We have a custom theme for our site, www.mathhelpboards.com that we really like but still offer the default vBulletin theme in case members prefer that look. A couple of members have written me that they see the old theme in certain forums (http://www.mathhelpboards.com/f45/ for example) but I always see the new theme without any issues.

My question is, is there anything that could be causing this on the server end? Is there some cache that could be cleared or some setting that might cause this? With another user who mentioned this problem on a different set of pages I asked him to clear everything I could think of off his computer yet the problem persists.

I'll provide pictures and more details if necessary. Thank you in advance.

Jameson