Dont know what causes this, and don't know what the problem is called. But it only ever happens when I use TG, as far as I know.
(See image below)
THis happened to me in the past only when I was using tons of memory Big objects in Gigabytes. Now it happens every work session several times. brought on by any number of actions. I can list them if you like, but I don't think what Im doing is the problem.
At the very least It would be nice if someone could define this issue so I can attempt to find some way to mitigate it on my end.
Hope its clear from the image what I am talking about.
I have that too sometimes, think it's memory. Since the preview became multithreaded I have more problems with TG (including this and crashes), I'm sorry to say.
I've never seen this myself, even when using lots and lots of memory. It's possible that a problem I've fixed just recently might have something to do with this but I'm not sure. What graphics card do you have?
ATI Radeon HD 5870:
Chipset Model: ATI Radeon HD 5870
PCIe Lane Width: x16
VRAM (Total): 1024 MB