sonic, were you able to resolve this? im experiencing a similar issue with premiere cs4. exporting to media encoder froze at some point, and i had to kill it with task manager. i was unable to load the project, as it froze while loading (hard drive light stopped). i was able to recover an older autosave and made about 13 hours of edits without closing due to fear of crashing. when exporting, it froze media encoder again (stuck on loading video) and premiere crashed. i am now unable to load any project files as they all freeze and i just lost hours and hours of work. i had to swith to another machine with cs3 and am starting over (aggravating). if there is a way to recover cs4 project, it would save me a lot of time. i tried updating from 4.0 to 4.2.1 as well, but files still didnt load. i also cleared the render and preview files and still nothing.....why cs4 whyyyyyyyyyyyyyyyyy????