Hi…
the joy of a 32bit application that happens to be a RAM hog.
Is your CS3 running the latest patch of that version.
Early versions of CS3 would lose connections to renders.
Also….it is my understanding that it’s not just the clips in your project window that PPro has to keep track of (which uses RAM), but PPro also appears to keep track of iterations of renders (not just the most current one). I could be wrong about that, so others might want to chime in.
This is what, for example, allows you to undo after making a change, and having PPro show a green bar from a previous render so you don’t have to render it again. So this also may take some RAM as well. This might explain why your project became so bloated.
If the worst thing that would happen is that you’d have to render again. Might want to consider shutting down Premiere, deleting the render files from wherever your project scratch disk is set to. Then moving forward, being a bit more judicious with how much you are rendering. Not sure the length on the render is as important as the pure number (iterations) of renders.
Another thing that helps is to clear your source viewer history every so often while working. At least I’ve noticed this.
Hope that helps. Anyone else?
Alex