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I have - although the tablet has been mentioned, the problem is entirely within Pshop.  I know because, one of the manoeuvres to fix the problem involved uninstalling the tablet from Device Manager, disconnecting it from the PC and uninstalling the drivers.  The issue persisted despite the absence of the tablet.

Intuos3.  I tried that before the manoeuvre above.

I have the unfortunate habit of repeatedly dragging panels out of position and resetting the workspace.  I love being able to hit the button to do it in a fraction of a second.