Steve, yeah that's what I meant about X2a, since I'm still using XP I can't get those bug fixes at the moment.
Also, no, I'm not using the lasso tool, just single click on header or body of clip with smart tool. After seeing something about lanes in preferences (I hadn't used them before) I expanded and realized that most overlapping clips (the ones that behaved better) were alternating in two lanes. This problem seems to happen if the newly pasted clip goes onto the same lane overlapping a clip in the same lane, in this case when I select the new clip (again, with single click) it takes the tail end of the first with it.
Sure one way to work this is to work with lanes expanded to make sure the clip I've copied does not overlap one in the same lane, but if I have to do this, I might as well use two separate tracks, it's a pretty big inconvenience.
Any suggestions? And can anyone who DOESN'T have the issue, verify if your overlapped clips are going into multiple lanes?