Hi Karel,
Here is the Setup you demanded:
It is just Cubase 5.5 on the host and VE with VI's on the slaves. the slaves are all 64bit Vistas (with 8GB RAM each) the Sequencer is also 64bit Win7. All rendered allready large Projects without any Problem before I updated the whole System (from Vista to Win/ and Cubase 5 to C 5.5).
I just tested the Problem with a new Project, to verify, that the Problem is not related to any Aspect of a certain Project.
It is absolutly the same Problem others seem to have with Kontakt. But I dont use any Kontakt in my Projects at all. And for me it even does not change the problem when I use the earlier Version of the VE Pro.
As the People with the Kontakt-Renderproblem I am also able to render in realtime, but even that is not that sure, since even than some of the first notes of one or another of the slaves are also not rendered. The workaround for me is now to start the renderprocess a long time before the Piece really beginns, render the whole as wavefile into the Project, cut of the long empty recording before the piece and render this again. That is awful and I hope you manage to repair VE as soon as possible.
I attached a Screenshot with a mp3 file which has not rendered anything for the first minute and than starts with just one Slave, while the others join in even later.
I hope that might help you to fix the VE-Pro/Cubase 5.5-Renderproblems soon.
best
Steffen