Drawings Dissapearing from the Vault!

I have one assembly that I have tried to check into thevaultseveral times to no avail.  When I go to check it in thecheckin dialog shows all of the drawings, parts and assemblies asusual. The weird thing is that when I hit 'Check In' the checkinprocess appears to be going normally but when it is finished andIopen the vault the parts and subassemblies are there but themainlevel assembly and all of the drawings aremissing. Furthermore, if I try to check in the assembly againto catchthe missing components they will show up in the check-inlist asbeing new but will not appear in the vault aftercheck-in. This only happens with this one assembly.  Ihave triedpack-and-going it but that does not seem to help. Has anyoneever had this problem? Is there a fix?SolidworksWorkgroup Pdm