Hey hope all is well.
I created a project in PE 4. Well, in what's looking like a not-so-smart-move midproject, I upgraded to PE 9. I opened the original PE 4 projectin PE 9 and it plays fine but won't render in the timeline. So, all of my effects and such won't render for a preview. This is actually an important project so any help would he appreciate. Thanks!
What happens if you save the project in PRE9, and then reopen this saved project? I think you would've tried it though...
This kind of behavior is common when a project is created with one version of the program and then opened with a newer version. This is why many of us on the forum (and I, in my book) recommend not doing this.
It's best to finish your version 4 project in version 4 and than start a fresh project in version 9.