Strange fills of color and shapes appear, disappear

[amandaa15478961]

For past few weeks, work in my multi-page file and the background would fill with color and strange shapes, glitchy.
It can take a minute before they disappear.
Program is up to date on my end.

[Laubender]

Disable GPU support in the preferences.

Regards,
Uwe Laubender

( ACP )