Very nice, I've missed this function of Stuff Plug since updating to WLM
Working good so far, and it's also notified me when I already have the window open and my contact hasn't closed their window, but they just haven't said anything for a while.
Anyway, I'm also having the "WLM messenger needs to close....." error.
I checked with my contact and he said it happened just as he'd said something to me, so it must be related.
Will any of the error report data be useful to you for fixing it?