Never had such problem with Shoft. Only with climate prediction, but that one is understandable. They warn that it needs plenty of disk space. But shoft never used almost anything to me. Maybe it's some random boinc bug. Have you tried detaching from it and reataching the project again?
@72CJ5 - I don't know what setting you are talking about. Is it in the boinc general preferences? And about the Shoft workunits, they have a 2 days deadline, which is more than enough given how fast they are crunched.
Credits are usually granted instantly, altough during this week their stats have been failing a bit.