@Lubo!
First, let me wish you a happy vacation

I tried ReWire a few times - the results are still mixed. It seems to start, but channels are assigned randomly (i.e. if I specify Output 3 and 4 for an instrument, Logic may receive it still on the master, or not at all.
To start playback from Notion, I have to press space twice. The first time, only a very loud "pop" is heard. The second time, playback starts. I have to do this every time I want to start playback.
Starting playback from Logic does not work at all - Notion will not play.
I did the following:
Created an empty project.
Added a few aux strips and assigned them to Notion 1-2, 3-4 and so on
Created channel strips in the arrange window
Started Notion and loaded a score.
Did I do anything wrong?
All these things happen on both my MacPro (Notion 3.0.3 and Logic 9) and my MacBook (Notion 3.0.3 and Logic 8).