I have an infected file that avast did not appear to detect (I scanned it from context menu), so I added it to the virus chest to send to avast. I decided to scan it from within the virus chest, and avast found it as Sf:Kelihos [Trj]. Why did the context menu scan not find it? I have every option enabled, and the heuristics is set to max. What is most dangerous about this, the file was not picked up by either the web shield or file system shield. I checked settings for FS shield, and code emulation is enabled, so I'm not sure what is going on. I'm using avast IS 6.0.1091 on Windows 7 x64.