Error Applying Plugin - Couldn't Find Entry Point (48::72)

Hi all,

Someone who bought my plugin reported these errors when applying it:

invalid filter (25::3)

couldn't find main entry point for myplugin.plugin (48::72)

They're using CS6 on Snow Leopard 10.6.8 on a Mac Pro 3,1 so it should work okay (the effect has been compiled as a 64-bit plugin using the latest XCode, on Mountain Lion 10.8.5).

Just wondering if anyone here has ever had this issue, and how they resolved it.

Thanks!

Christian