[Ty Cobb]

Your world.dat files are not wiped out. So far as I know, you only need to restore the original DB (hence the call to back it up) and those games should work fine.

While I recommend Spritze's DB over the included one, if all you want in '15 is a random debut, on the first screen after selecting New Historical Game, just choose, "Use random players from all eras instead of real rosters." You'll then be presented with two drop down menus that offer the option of controlling which years start and end your supply of players. Spritze's DB includes the supply of Japanese and Negro League players you're seeking.

As for your other games, I haven't tried this yet, but I know that in game creation it is possible to designate custom data folders for the game under the advanced setting tab. Might want to post a query in the tech support forums, or ask for someone who's tried it, about the possibility of multiple OOTP 15 folders in your Application Support/Out of the Park Developments library.

I'd also crosspost this into general questions and see if we can gin up some enthusiasm. Perhaps...just perhaps...Markus will consider a specialized platform specific discussion areas in the forums for us lonely Mac folks.