False Positive?

I'm using computers on my university's network, which run Sophos Anti-virus. They've suddenly decided that most of my portable apps contain the Mal/Behav-128 malware. I tried downloading and installing ClamWin Portable. The installer worked fine, but Sophos blocks the actual program from running once installed, because of Mal/Behav-128 in 'E:\Portable Applications\PortableApps\ClamWinPortable\App\clamwin\bin\python23.dll' I tried running a test using both single-file virus test utilities mentioned on the support page, but Sophos prevents them from uploading the all the dll files I test. Since I'm not an admin, I can't change anything about Sophos. Ideas? There's no real malware here, right? Sophos' profile page on this specific malware isn't very convincing. http://www.sophos.com/virusinfo/analyses/malbehav128.html

***Update, two hours later***

Seems to have fixed itself just as suddenly, except that I can't download virus definitions. Probably a firewall thing.