I have to correct myself. After extensive testing I can say that the pll is the only ip core that shows this behavior. And, I didnt expected this cause there was no error during the compile, I also cant add the [altera pll] ip core to a Quartus project. A small window appears [loading MegaWizzard...] and, while for all other ip-cores I can now config the Core, nothing happens when I try this with the altera pll. So this is, for me, not only a Qsys Bug.
I testet this with Version 14.0.0 and 14.0.2
Do i have to set an extra environment variable for this core / the MegaWizzard or is there a Log-File that could help to locate the error?