I just upgraded to the trial version of Draftsight Pro so I could import PDF reference drawings to trace over. It worked fine for most of the tracing but eventually the cursor started acting up as mentioned on other threads. I updated drivers, tried a wired mouse, etc. There are are a lot of splines in the tracing. When I turn off the PDF layer the mouse works as it should. Also, the mouse works fine outside of the PDF limits. Any ideas?