A problem we had with the practice test is stations not allowing students to log on because a test is still unfinished on that station due to a previous crash. The solution is to delete the files in C:\pf\qcatesting\dps\backup and the C:\pf\qcatesting\dps\upload\ibpset folders. (from memory)
This solve the prob but I suppose with the real summative tests if we do this the student willnot get any result (apart from being fed up with the whole process)!
Tomorrow we plan two classes to do both parts, on class of 30 at a time.