I normally don't use AV software on my PC, but depending where I am, machines I work with have them installed. I tried latest available compiler on computer with installed AV called Zone Alarm or something, and every time I hit "beta compile" I got some attention dialog from the AV popping up saying: "Potentially harmfull file with executable signature... something, something... in anonymous ..something... location, ...something!".
Then I have to allow things and then compilation continues. If I don't allow nothing happens, compilation fails.
I also checked temp dir afterwards and it's kind of flooded with .tmp files. If I delete all temp files there and try again and this time allow everything I still got .tmp leftover(s).
If I say I know why this happens somebody (politically correct asses) will again say I'm britney bitching, so I won't. I just wanted to let you know