Yup, me too. I've been seeing that ashServ.exe error on shutdown intermittently ever since updating to v4.6, on two different computers (currently, v4.6.603, and problem happened once today). If I remember correctly, the error was an Access Violation, but my memory is not 100%.
So far, I haven't found anything in common that I've done each time this error occurs. If I do, I'll update this thread.