Extend/Trim problem

Wanted to see if anyone else has encountered this. Draw a pline in a "zig zag" formation. Now draw a regular straight line to either side of it and try to extend to it with one click. Now draw another line crossing over the pline and trim it with one click. For me it takes more than one click (sometimes three clicks) to complete either operation. In V7 this didn't happen. I issued a support request on this but they could not reproduce what was happening to me. If this a problem inherent with my system (video card, op-system and etc.) I have no clue where to start looking. Anyone have any ideas? Thanks!