L&L problem

I keep having to re-do "track motion" even though I have not changed anything. And some clips with transitions will not work unless I take out the transitions first, then re-do "track motion" and re-render. However, if I put a transition back in, I have to do the whole process over and then I get the little dialog in my render that the clip has changed - even though I didn't change anything other than add a transition. The tracking data control says, OK, but it won't render the part with the transition. If I can get this working right, I'll buy, but this is a struggle.

Running SL with FCS 3.

HandyGeek