iMovie edit button greyed out

iMovie version 9.0.4
Mac OS X version 10.6.8
I started having the edit function grey out when I started a fourth project. iMovie also stopped showing my project in the upper right playback window, but it would show my events in the upper right playback window. Also, full screen playback wouldn't play the recent projects, only it would play two other finalized and fully completed/shared projects.
I successfully tried finalizing the three projects, even though I had yet to add sound and titling. The edit function returned for a day, and then it quit to the greyed out state button the next day I opened up iMovie. I will continue to open, close, and restart the computer entirely, with the hopes it will decide to work again. What else can I do?

I solved my problem by trying to buy the newest version of iMovie, and finding out my operating system also needed updating in order to run it. Whalah! Familiarizing myself with new iMovie now, and getting the movie projects moving again. Yay!

Congratulations on solving the problem by yourself Heather! Let us know if you need any further assistance.

Nice. Glad you weren't depending on my troubleshooting skills for this one. I was clueless.