In my current setup (Ubuntu 18.04, nvidia-driver-430) I experience this issue when using Gnome-Calculator or gedit.
Most of the other applications are not affected.
Changing the gnome theme through the "GNOME-Tweaks" app helped to solve the problem. Affected themes are Ambiance and Radiance, all others seem to work
In my current setup (Ubuntu 18.04, nvidia-driver-430) I experience this issue when using Gnome-Calculator or gedit.
Most of the other applications are not affected.
Changing the gnome theme through the "GNOME-Tweaks" app helped to solve the problem. Affected themes are Ambiance and Radiance, all others seem to work