Would you, by any chance, have an idea as to why my son's Win XP PC successfully sends the completed work unit and receives a new one, but doesn't start processing it automatically? [I think he said he had to reinstall F@H to get it to start processing the new unit.]
I have no idea... is he running the GUI version or the console? I know the GUI version can be set to stop processing when the current WU is finished. The console version has an option called '-oneunit' that will cause it to stop work once the current WU has finished.
Beyond that, I'm not sure right now without knowing more about the setup.