Notebook, and main rig tested, screens fine (although the ones I take with fraps are of higher quality).
Thanks for the information! 
The bug with those white spots should be fixed anyway since the latest update. Only windows seem to look not right yet. But we give those screenshots a low priority from now on, if the quality is not satisfying it's recommended to use an external program (e.g. fraps). Most capturing programs can also produce .jpg files (causing the image file to be much smaller than our .png's). As soon as the game is on steam, one could use steam's screenshot function, too.
