Without going into great detail how I arrived at knowing this matter of PBBs compatibility, some may know what I'm talking about.
Primarily, Logos 9 Personal Book Builder is NOT compatible with older versions of Logos (specifically Logos 8). The odd thing is that it was purposefully done that way. The incompatibility issue is not a "bug," but was determined to be that way. Why? God only knows. I'm guessing here, but someone in software development suggested, during the development of Logos 9, that the Personal Book Builder feature be PURPOSEFULLY incompatible with Logos 8.
Having lengthy discussions with Customer Service, there is not a clear avenue to resolve this issue. So, the bottom line is this: if someone uses the PBB feature, allot as I do, one is forced to live with Logos 8, and some may understand this as a good thing.
The software engine of Logos 8 is completely different in Logos 9. If someone upgrades to Logos 9 from an earlier version and has numerous PBBs, that person will have to REBUILD from the bottom all of those books that were built in earlier versions. Logos 9 does not recognize PBBs built in previous versions, meaning one cannot "upload" previous version of built books in Logos 9, which means that if one uses more than one computer (main vs portable, mobile) that other computer will not receive the syncing process because the "upload" button feature in Logos 9 is ghosted and cannot be actuated.
One person answered a previous post of mine saying "dump 9". I now agree.