Aganju: What do you do in step 2 'I modify it slightly'. I do not understand what you mean with that.

Chaos: I imagine it means he moved one of his preplaced pieces.

Aganju, how about if you handle it slightly differently. Go into the Editor, and change it (your "slight modification", and save THAT, and then try to use THAT as your placement? A little of a pain, but it MIGHT work.

rod03801: yes that works, but I would have to overwrite or save the changed position every time. It should work without that, right? And the really strange thing isthat it seems to work, but the game comes back to me blank after several hours only.

Aganju: Yes, it SHOULD. (I would think so anyway). But I haven't used the editors in several years. I was just proposing a possible "work around", that would be easier than starting from scratch.

rod03801: understood. I might actually go for the solution proposed below by 'cookie monster' (I thought it is 'vegetable monster' now??), because I'm afraid someone is willing to put the effort in to find my starting position from last game and track my moves and gain a significant advantage.
(not that it would be needed at my current level of play - you can still win easily against me if you know a bit what you do)

Aganju: Yes, I am a fan of random placement, and just keep clicking it until I get one that makes me happy, then make a few "tweaks" to it. I'm almost positive there are no problems with modifications when using that method.

Chaos: I mean that I move two or three pieces around, for example take two out and place them switched. I typically do that, so opponents cannot check earlier games to see whee my headquarters is.

Aganju: I had similair problem in one or two games recently.