When my database was previously converted (I think from RM v.3 to RM v.4 and maybe from RM v.5 to RM v.6) there were problems with the conversion process.
A lot of the info in the Source Details got moved to Detail text: Research Notes. In fact, I am STILL, years later, moving info from Research Notes to Source Details. It seems as if the note in Source Details was "too long" (although I don't recall ever seeing a specified limitation), then the info was automatically moved during the conversion process. How long was "too long"? I can't say for sure. Notes like "volume 1, page 463" stayed in the Source Details, but longer notes like "volume 1, page 463; John Brace Doe m. Susie Wilma Johnson" got moved to the Source Details.
The database tables were apparently redesigned along the way, and the way we apply tags and captions to linked media also changed. We used to have a separate caption and description for every re-link of the media to a new fact or individual. Then a change was made to make all links of the same media re-use the same caption and description. HOWEVER, the software discarded thousands of my separate captions, probably because there was no way to identify which was the appropriate caption and description to keep. Again, I'm am STILL, years later, working on correcting this problem.
When I convert my RM v.6 database to RM v.7, I hope these problem will not re-occur. Oh, yes, I'm eagerly looking forward to the next version, whenever the Roots Magician is ready to release it!!!.