Most times when I launch my computer, I get this "blank/delay" effect the first time I select one of the desktop toolbar dropdown menus. It can take 10+ seconds to load the menu

The red line represents approximately where the right border of the menu would be
Attachment 96862

Another thing that occurs when selecting one of these toolbar menus, tho less predictably and not necessarily at startup (for this reason, I could not reproduce it for presentation), is that the top of the drop down menu hides under the desktop taskbar, while the remaining part of the menu below displays correctly (not blank).

thanks

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Win 10 Pro, Intel Core i5 6500, 16g ram