Silk Test Classic will occasionally have problems on machines running virus detectors that use heuristic or algorithmic virus detection in addition to the standard pattern recognition. What happens is that while Silk Test Classic is running, the virus detector identifies Silk Test Classic as displaying "virus-like" behavior, and kills or otherwise disables the agent. This leads to unpredictable and inconsistent behavior in Silk Test Classic, including loss of communications with the agent and inconsistent test results or object recognition.
To avoid this problem the only solution is to temporarily disable the virus detector while Silk Test Classic is running.