Hi Jeff,
One of the most likely problems with your DBC and VSS could be that you (a) did not check in all the files of the DBC (which is dbname.DBC, dbname.DCT and dbname.DCX) or (b) you did not check out all these files. You might want to get the latest version for this and all the tables you had modified the last time you checked stuff in, and then check everything out again.
Rishabh.