I left a distributed render over the weekend on 3 computers, it was set to do 400 passes, as you can see in the screen capture the max render progress shows 91/400. it has shown that for several days but the stats on the corona frame buffer shows 550 passes. so the max progress is locked some how, and corona did not stop at 400, when i saw that i just left it ruining since there was still noise, the problem now is the render cant be stooped neither the max cancel nor the corona stop buttons work.
I was able to save the image from the corona framebufer but obviously there is something wrong.
the logs in the nodes corona servers shows that it is still rendering but the main max season is not responding.
this is in Max 2016, corona daily 2015-10-09