Andrea,

Thank you for transcode.txt (very helpful how you did this).  I believe after looking at it, the line:

              ....VIconThread::draw_lock, VIconThread...

is pointing to the same problem as diagnosed by Andrew for the last couple of weeks -- that which has now purportedly been fixed and checked into GIT.  If you do have any time to test, please use "mouse over" again if you can tolerate a potential crash as that will help us to know if the assertion/asynch_lock bug is really totally fixed.  Thanks, gg/Phyllis