I updated my old ps3 fat to rebug, and some of my games launched with webman will just go to black screen. I have to reset. They used to work with multiman I know I made a mistake to not remove all old pkg files before I upgraded.
Have you "tampered" with the console ID for that one? Like for example change it from debug to retail or the opposite? That changes the console ID slightly and will break some cryptographic functions (it behaves like if the files were moved into a different PS3 console (because the ID is what is used to tell if the file is native to that console or not) so some DRM protected games, trophies and save files cease working.
I did the console id, but it wasn't set to QA or DEX, so it didn't work. A terrible side effect of going from 3.55 KMEAW was all my psn purchases don't work anymore..
Changing a single bit on the console ID (change the region for example) would break the local signing the same way as changing DEX/CEX. Changing the console ID makes it being a completely different console so it will "defeat" all of your PSN purchases and make your activation file invalid in addition to breal all local signing. (the PSN activation file is locally signed just as protected saves and trophies) Restoring the original ID will restore all of the contents to their original working state.
You changed the region for getting it to play video discs from another region? That would be the only rational benefit at tampering with the console ID and of course it only makes sense on CEX consoles as DEX can't play video discs (DVD/BD). It may be possible to re-sign locally signed contents for the new ID, but it's really a enormous hassle.