After editing and grading, I need to render the work area for a normal preview. When I render the work area everything works as it should, but when I close the project and turn off the computer, tomorrow, when I open it again, the work area isn't fully rendered!
So I need to render the work area once again, and it's time consuming...

This never happened with CS5, unless I clear the cache with a program like ccleaner, but I'm not doing this now and still some parts of the work area aren't rendered when I open the project again..

Why is this happening?

Thanks everybody.
Mladen Ilic

I'm still on CS4.0, but it should still be the same concept.

Is it safe to assume that you're saving your project before closing?
Because, after a render, there should be a .prv folder related to your project under the "Scratch disk" location. Under the .PRV folder for that project, there should be rendered video and audio files. See if the rendered files are disappearing on you.

Why don't you give us a list of what your drives are...
Where's the Captured drives, scratch drives, and tell us where you Adobe media cache is located..