Hey! I met this problem recently, and it's very hurting me.
I can not use the defocus effect, even though I have GPU accelerating on, enough ram to power a family of 4, it can't simply render it. I can see it in preview, it works perfectly, but once I want to render it, it stops, writes incredible render times (25-30 minutes to a simple 5 second long mp4 with defocus), then crashes, stops the render. What could be the problem?
Thanks!