Tried some other games, 3D Dot Game Heroes, Monopoly Streets and Vanquish are working, even with updates. Updating with JB was not possible.
Installed another CFW today, which is supposed to run signed and unsigned pkg files, didn't have any success yet though (pkg files are homebrew, PSN games, minis...).
New manager was released, including the level 2 patch, so that you don't have to run it when starting the console. Works fine, but manager itself freezes a lot when trying to start it, waiting for some fixes.
I was also in the PSN store and downloaded the Dead Space 2 demo, works fine, and as seen on many forums, online playing is also working just fine.