I updated from Kubuntu 16.04 to 17.04 a few days ago to fix some other
issues with frequent crashes and on Kubuntu 17.04 am now also affected
by this bug.
I tried updating nvidia driers to 381 and 384 but I could detect no
difference between 375, 381 and 384 (from ppa:graphics-drivers/ppa). For
now I switched to XRender as recommended in #16. OpenGL 3.1 and 2.0 both
have the rectangle below the cursor.
I also use a dual screen setup but I could not detect a difference
between leaving the external screen unplugged or not.
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Mouse pointer behaves strangely
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