Multiple layers added from one click

[Jonopen]

(PGD365/Win10)

This keeps happening after my laptop is awaken from hibernation.

A varying number of extra layers are added following a single click to the 'add layer' button in the Page & Layer gallery.

In the attached screenshot example an extra 21 layers were added. Normally it's about 4. It's a royal pain in the derrière because although you can undo, you can only undo one layer at a time. Obviously the work around is to close PGD between sessions, but...