So that's a 'no solution' for #2 for now. Kind of relieving though. I thought it was me.....
Thanks for your reply!

That's what I've been doing. I'ts quite an effort though to do that with every item you want to use.....
Thanks for your reply though.

@emn said:

I guess, because the glass panels are situatied behind each other, the computer keeps reflecting the scene indefinitely.
Is there a way to tell vray to reflect all the objects in the scene 1 time instead indefinitely.

Forgot to say - you can set how many times the glass reflects/ refracts with the "refraction max depth" setting. In global settings, you also can set "Max transp levels" and a refraction override.

Andy- To avoid that issue, turn off your scene transitions, and set the scene duration to 0. You shouldn't have a problem after that.