Hello

I did many tests and conclude that the intermitent problem ( little windows pop without acces to Reality interface)is not caused by one or another piece of my scene

Sometime i just reclick 4-5 time and finally i got it like in this scene, rendered with Reality  (original has 2658 by 2505 pixels here reduced  of course)

I can also conclude that the more i use Rality render the more i like it very much

Many thanks to developper for this excellent plugin