It seems I'm having a lot of problems when using masks in resolve lite, as soon as I've added a mask there's a fairly good chance of the mask just flashing every third frame or so (so that the adjustments I've made to the mask switch on and off as it were) or it just flashes a weird purple or yellow. The rendered clip shows this flashing, making it useless.
Weird thing is when I try to go frame by frame in the Color tab to examine these flashing anomalies, I'm unable to pinpoint the "bad frame", almost like it's happening between frames.
I've updated resolve to 1.2 to no avail.
I'm trying to render in ProRes 422 HQ, the clip is a 29.97 fps video, (as it was shot in), the camera was a Canon C100, AVCHD, edited and exported from Premiere Pro CS6 in Prores 422 HQ as well.
My computer is iMac late 2013, 16gb 1600MHz Memory, 2.7GHz Intel core i5, the Iris OpenGL graphics card sucker(starting to regret that one), and a SSD HDD.