This occurs every half hour or so and there is no way to get them back other than to go into mate-tweak, change to marco, then back to compiz. But, the problem, re-occurs half an hour or so later, on average.
Anybody else experienced this problem and got a fix for it?
I’m currently using Ambiant Mate with Faenza Dark icon set. But, it occurs on all themes I have used. My GPU is an AMD ATI R7200 and I am using the proprietary driver.