At least I found a possible cause for that behaviour because I remember what I did change in my script...and I think there are few people who won't like this...
The screenshots show almost the same but- the first is different: Texture-preview was shown on a sprite, in the second screenshot the texture preview is just 2 raw triangular faces and 4 vertices.
I changed it from sprite because I discovered that it's impossible mixing 2d-sprites and textured stuff in 3d. In the first place it works - but as soon as one has a texture on some mesh displayed in scene the sprites go crazy and ALL sprites show the SAME texture but not the one that they're supposed to show - they just show same texture as the last created object in 3d has applied. All of them.
No matter what I do- even load another sprite, destroy it or set another texture to it: that gets ignored - the sprites show what they want to but not what they're supposed to. So that's the reason why I took all the sprites out of my script.
And that's all I changed about that - and now TextureRepeatMode does what it should
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