Having the same problem.
Hi, I've been trying to insert some textures into the ISO but an error pops up everytime saying "unhandled exception, JIT Debugger) or some shit like that. Yes, I've done all the necessary steps to successfully mod Dissidia 012, but for some reason for the past two days I have not been able to insert any new textures and the error I mentioned above pops up every time I try to insert be it GMO or GIM. If anybody could help me with this, it would be greatly appreciated. Kudos!
Right click on the iso file then left click on Properties in the Drop down menu, make sure read-only is not checked ,if it is uncheck it and then press apply then press OK button