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Did you do any updates of the OS between this and the last time you used AE?
Sounds like a simple prefs issue but I've never seen this parcualr issue so You might search for a broader collection of statup issues.
Locate your AE prefs and trash 'em. There are several threads on how to do that around here, strongly urge you to search them down before you just plow into your library and start throwing away Adobe-labled app support and .plist files.
You may also find additional advice on apple.com's discussion forums.
Also, give the forum a few more hours, if you can, to see if the power wonks offer better advice.
Interesting article, but I knew I was leaving PowerPC apps behind when I moved to OS 10.7, and Adobe claims that After Effects CS 5.5 is fully compatible with Lion. But you must be right about prefs; there's gotta be something causing the Mac OS to think this version of CS is ancient...
Since my initial message, I've tried and failed to find any details about how to select the right prefs to delete. I also ran Disk Utility to repair permissions on my system drive. That got rid of the PowerPC error:) Now on startup AE says mediacore fails to initialize. I can choose to quit or continue on that error, but continuing just results in another error that says dynamiclinkmanager unexpectedly quit, and then AE locks up and I have to force quit it. Not much progress!
No other answers on this so far... Before I uninstall the entire Creative Suite and then delete all Adobe system and hidden files everywhere, any more suggestions? Or a list of the right prefs I should trash?
I have the same problem! what the heck! but mine is different, i just got a brand new Macbook, and its should be fine. Its never had anything but Lion on it, and it says "OS X 10.7 can't run PowerPC apps".
uh, duh! but the photoshop CS5.5 that installed with it and Premiere Pro CS5.5 work, so why not this! help!!!