Yup - I reinstalled a couple of weeks back due to exactly those issues. The cows still tip over on occasion, but V5I doesn't run in circles anymore, thankfully. I suspect the beta patches..

Ehh...well, this thread is nearly a year old, and I'm using XSI now. Heh. However, I seem to remember something about the naming having to be the same, e.g. 'Light1' in Vue should have the same name in LW, or the synch won't happen. I also have a dim recollection of having to click-select camera and light in the LW sync dialogue box. If this doesn't help (which it probably doesn't), you should start a new thread - surely others have tried this with V5I. I might try it with XSI, just for kicks..