I have this annoying situation with mouse movements and the widget dashboard. First, let all be assured that my widgets are locked.
Some times when I move the mouse quickly, usually in the proximity of the application launcher, the Widget Dashboard screen comes up and the open programs disappear.
The only available item is the trashcan which I click on it and the desktop is restored with all the open applications, but the trash screen is opened and I must close it. Also if I right click I bring op the desktop settings screen and the desktop with the open applications reappear. Again I must close the desktop settings screen.
I don't want to remove anything through synaptic that pertains to widgets lest I screw up my set up.