Hi Matt
I write again. I am having what sounds like the same issue regarding memory of the rendered timeline. My project was running fine but it seems that ive reached a point where it no longer holds the green rendered time line bar. On opening the project its asking for a render.
Did you get to the bottom of the problem? or have you thrown you pc into the ocean? Which is what I am toying with at the moment.
Very frustrating
Rgards
Warren