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As a start, move the KLF plug-in out of the shared MediaCore folder (Library:Apllication Support:Adobe and something; not on my Mac ATM) to the conventional AE plug-in folder (Applications:Adobe After Effects CS4:Support Files:Plug-Ins) I've reminded my friends at RG a hundred times, but their installer stil luses bad default locations. If that doesn't fix it, then indeed you have a problem. Which version of the plug-in are you using? Most complaints revolve around v2.5's GPU usage, which is on by default and causes a lot of trouble. Older versions do not do this, so they are more stable....
Tried moving the files to the plugins folder, AE launches fine but when you try to apply an effect a message pops up saying 'cannot find entry point for [plugin name]'. Red Giant support just recommended checking permissions on the files but that didn't work, same errors about mediacore when launched. Thinking the only way forward is to re-install CS4, bit of a pain but I need this plugin to work on some files I've been sent.
Thanks for your help so far.
You can get that error if you are using an outdated plug-in. For example, a PowerPC plug-in that hasn't been updated to support Intel. Or a CFM plug-in that hasn't been updated to MachO.
Make sure that the version of the plug-in you have is CS4 compatible.