>I've narrowed it down to the Appincl.dbf change that I made to the VERSION_LOC entry. Apparently this doesn't allow my endusers to find the default database which is stored in the registry. Now I have to find out why their registry was not updated when mine was.
>

This info stored under the \HKCU\Software\CompanyName\SoftwareName\VersionNum setting. After making this change, their app should have started up with the standard "This is the first time you've run this" message (since it will be looking at a different spot in the registry). Is this what happened?

>BTW, while looking around my Cursorsource under the oErrorLog in the EventLogEnvironment got changed to "..\h.dbf" Is the correct cursorsource 'errorlog'?

That sounds like the environment got messed up by the builder - it's happened to me on a few occasions. Usually at that point I'll just delete the environment and recreate it. I think there was a thread here sometime back about this (and some fixes), but I don't remember what the specifics were.