I think so... I am using R139. The last version I had I think was R134 and I had no issues with that version. The release before that though I had the same issues I am having with R139.
It seems to just be a time thing. If I open C2, do nothing, it closes fine right away. If I let it sit, even without working on a CAPX, it will crash on closing. Working on a CAPX it almost always crashes on closing.
I can still save and everything seems to be OK. My apps still export just fine and I've had no issues beyond my own failures and mistakes as far as that goes. Its just while trying to close the main window it crashes.