If you are using Ubershapes, try exporting them as Facts and re-importing. (v8 has an auto re-import feature which makes this easy), then turn off the original Uber.
I am not sure I have any more suggestions off the top of my head right now, but please hold onto this project!
We would like the Beta team to have access to it if possible to see if there are any real bugs we can squash.
Tom and I will investigate rendering to numbered image sequence.
Please keep us posted on anything you figure out.
Dave