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The drop down menu for files in the upper right corner of the editor gets erased as the cursor passes over it. The menu is drawn fully upon clicking on the icon, but as the cursor moves down to select a menu item it is erased one by one until all that is left is the right and bottom boundary lines.
Known bug on Mac: 102503. If you have reproducible set of steps how to reproduce this error, please write them into 102503, thanks. *** This issue has been marked as a duplicate of 102503 ***