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I made new watermark images in the same size as the thumbnailsettings (100x100 and 50x50). Still the same problem. And everything looks fine with GD Library..
The only common factor I can see among the images that have the problem is that they have a pale background color..
Really not sure if I can do anything there, if this will be some server settings, then I think, I cannot do anything there (and didn't hear about such problem yet, so no experiences to give some useful advice )