I had the same problem, some .swf files not playing after installing CS5 Suite, on Windows 7 x64. Does anyone on mac has the same problems with CS5? I don't have CS5 for mac but willing to test it if you send it to me
As far as I can tell the problem comes with CS5. Here's what I did: clean Windows 7 x64 install, CS5 master install then Resolume Avenue 3.2.0. Nothing else so I won't have anything else to blame. Of course, some of the files would not play. CTI scrolling on the timeline but displaying only the first frame of the .swf
I went to Adobe's site and looked for an uninstaller for Flash Player 10 and an older Flash Player version. I couldn't find Flash Player 9 on their site so I searched for it on Google. I ran the uninstaller for Flash Player 10 then installed Flash Player 9. Abobe says you should restart but I didn't. Started Resolume and flash files were working. Problem solved.
One more thing, Mozilla only recognized Flash Player 10 so at that time it wouldn't display any flash content. So I installed Flash Player 10 after all (the one for Windows OS and Firefox browser, can't be sure for others), and to my pleasant surprise Resolume still plays all my swiffs with no problems. I'll also mention that while installing Flash Player 10 I had Resolume running. Not sure if it counts, but there you go!
So, no problems with CS5, Resolume or Mozilla for me. All the files mentioned above are free to download and easy to find. There might be easier ways to do this but I gave you my exact routine just to be sure. If anyone has problems understanding what I wrote or wants links to the exact files I used feel free to PM or e-mail me (not sure it's displayed on the site, it's firstname.lastname@example.org