> lcBuffer = strtran(m.lcBuffer,m.tcOldDBCName,m.tcNewDBCName)

Only one gotcha here - the dbc name in the backlink (which is basically what you're using here) must be null terminated. So:

lcBuffer = strtran(m.lcBuffer,m.tcOldDBCName+chr(0),m.tcNewDBCName+chr(0))

otherwise, you may get an error if the new name is shorter than the old one.