This is driving me nuts. Is anyone else able to reproduce this or is it just me?
Open this patch in Max 5 (make sure Overdrive is on), and turn on the toggle.
The Max window should say that "JS is in thread: 0".
Close Max 5 and do the same in Max 6 (again, making sure Overdrive is on).
What does the Max window say?
Despite Overdrive being on, Max 6 tells me that "JS is in thread: 1".