Yup it has been working flawlessly until the weekend. The only thing that is currently different on my computer is that I have installed Max4Live (not sure how the twos are related, but i doubt that is the cause) a few weeks ago.
ARC is now often acting up and crashing (i.e. not being responsive, frozen) when used hooked up with the computer.
Similarly, my Grid rotated the orientation automatically
I use the two controllers mainly with monome modules, but occasionally hook them up to the computer.
I am on OSX 10.9.5