AFAIK, Nass is running a very recent version of zMUD if not the latest. So I'm guessing that the maps he is referring to were created with the new zMUD database format... and thus wouldn't really be amenable to conversion with zsConvert.
So, in short, I don't believe upgrading will fix this. I'm not sure if the answer lies in an actual database index that is not present or in the values in VersTbl (which form an index of sorts, at least telling which number should be filled next in each database). I'm suspecting the latter...
It might be possible to mess around with the table in Access... if it helps, one map I have (working under 6.62) has a VersTbl that looks like:
VersId VersNum IconID MetaID DrawID KindID FavID ZoneID ObjID ExitKindID NoteID StyleID ExitID DirID
1 30 2 18 20 1 1 53 16685 3 16 1 43580 11
If none of that helps, I am fairly close to releasing a ZoneCopy utility which can copy zones from one map to another (and therefore get all the zones from the old map database which zMUD can't open and copy them to a new map database). I've just been quite busy recently.
- Charbal