I’ve been having the same problem, I work in Visual Studio 2012 writing VB.NET programs and Avast keeps snatching my compiled programs and say they have Win32:Evo-gen[Susp].

This started about a month ago and is getting worse, and makes working very difficult, Avast doesn’t even seem to take notice of any exclusions I setup, I’ve told it to ask what to do when it finds a suspicious file, but no it just does it’s own thing.

I have scanned the file with Avast, result is no threat found, I’ve uploaded the file to Virus Total and 47 virus scanners say it’s clean.

See my thread here

It may well be time to move to something else, Avast is getting too complicated and problematic.

Edit:

Actually looking in the virus chest, this has been happening since December 2012, it’s littered with my programs and nothing much else.