I have one guy using SW that complains that after he checks in drawings the next time he opens them some of the components are missing.  We use Workgroup PDM and I believe the vault is working fine and he is the problem. He says that he will save and check in drawings in the morning and then again before he leaves for the day but when he comes in the next day things are missing. Any suggestions on how I can check or track what he's doing so I can fix the problem??