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Did not realize a newer version of Multiman was out...but I upgraded same as you...then added the newest Gaia, the newest Multiman (at the time), and Blackbox 1.2....absolutely nothing else...no lv2 pkg stuff...its built into the new loaders.
As far as Multiman...the file I installed was called:
multiMAN ver 1.15.03 BASE [20110205_170000]
Every game working that I have tried.
Silicon Skullz Society
download an earlier version of multiman like 1.15.05, newest version of multiman has no built in payload, so u need to inject ur own or run the lv2 patch before loading, also i would imagine you would need to replace the eboots of the games as there probably pre patched for 3.41, hope this helps
Edit your options.ini file to point where your games are, or move your games to a path already setup in multiman.