[ubuntu] DraftSight cursor jumping in model window

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http://ubuntuforums.org – Hello guys, I'm looking over for solution of my problem, can't find anything on Google... I installed DraftSight on ubuntu 11,04 and everything seems fine except the cursor moving in "Model" window only. It doesn't moves smoothly like everywhere else, it moves with jerky jumps, much like Snap tool is enabled, which actually isn't enabled. Can anyone help please. Thank you guys... (Hardware)