Hi I recently upgraded to cIOSX rev19. At first I installed with the default settings (IOS249, base 57), but I found Monster Hunter Tri froze after starting a new game. So I followed what others have said and I've switched to IOS249 with base 37, by running the installer again. Now MH Tri is running with no problems. In the cIOSX rev 19 thread, supersonic5000 said: I've tried running Muramasa, New Super Mario Bros Wii while having cIOSX rev19 on base 37, and have yet to experience any slow down. 1. Has anyone experienced any slow down or problems with base 37? According to supersonic5000, 57 is the fastest. 2. If I do find problems playing games, if I have to switch back to base 57, do I have to run the cIOSX installer again? (Is this the right method) 3. When I switched from 57 to 37, did that completely overwrite the base 57 installation? I'm trying to figure out if I'd have to keep switching between bases. Thank you.