Black dots on grid when working over Citrix

The grid looks weird, with black dots all over it, when working over Citrix. It works OK for some time if I restart the application, but after changing windows (Alt-Tab), and going back to PL/SQL Developer, issue reappears.

PL/SQL Developer version is 11.0.5.1790

(I don't see a way to attach a picture, only a link to the picture, unfortunately)

upd: I disabled "Faded disabled buttons" and "Display buffering", and I don't see the issue anymore, it seems to fix it.
 
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