Draw suddenly very unstable

Hi

I've got a real problem with Draw( X6-64 bit). Things started acting up a couple of weeks ago with jerky behaviour in export selection. I posted a thread to that effect. 

Since then I'm experiencing multiple crashes daily; usually and oddly when I  inadvertently drag a tool (crop, text box, etc) out of the drawing space onto a surrounding panel (see attached). The screen freezes and never recovers.

I've checked my graphic card is up to date, checked the monitors and display settings (I use two and the problems occur on both), uninstalled and reinstalled X6 and with a newly created workspace. 

I suspect the problem may be with Windows as much as Corel as I'm getting slightly erratic behaviour elsewhere, though no where as bad as in Draw. Neither Norton or C Cleaner report any problems.

Has any body got any idea of where else I can look for what's causing this?

Thanks, Colin