I hope this helps. I was having the same issue with RebornBuddy force closing on me before it even fully loaded. I saved all of my old RB files onto a USB drive and did a fresh install. I then added each file back one by one, launching RB after each file transfer.
Turned out for me that the Kefka file was causing it to force close. I don't understand why but it works for my boyfriend and not me. I even tried using his copy on my PC and it didn't work. Long story short, I unchecked Switcharoo under plugins since it kept defaulting to Kefka and now it works.