Toolbox dropping parts randomly

One of our user is having this issue of parts getting dropped randomly. Its like he move mouse from one hole to another and toolbox drops parts on the path of the cursor of the mouse. These random parts appears transperant and can't even click on them until transperancy is turned off for that part. Pls see attached picture. We are on SW 2010 SP4.0

I tried reinstall of solidworks. Tried Software OpenGL. Nothing worked.

Any suggestions,

SolidworksToolbox