MovieClip limit in Flash CS3 library?

Hi everyone,
I have a Flash CS3 file with approximately 3,140 movieclips in the library (it’s a county map of the entire US) and the file won’t compile correctly. No scripts will execute (even a simple trace on the first frame) and the syntax checker doesn’t even work (you can type anything into the actions panel and it will tell you there’s no errors). Something is definitely wrong.
I’ve contacted Adobe support about this but they don’t have anything documented on library asset limits. Has anyone else experienced this?

Thanks for your help,
Phil

P.S. I’ve tried to publish this file in AS2 and it works fine, and I’m also certain that it’s not related to corrupt files.