plug-ins in aperture
it's possible to remove some pluins from aperture ?
it' s possible that some plug ins prevent to export some version?
iMac (21.5-inch Mid 2011), OS X Mountain Lion (10.8.5)
See this document: Aperture 3.4 and later: Some third-party plug-ins are no longer compatible
Check with the manufacturer's of your plug-ins, if the plug-ins are compatible with Aperture 3.4.
To uninstall, remove them from the folder
/Library/Application Support/Aperture/Plug-Ins/
They are either in the subfolder "Edit" or "Export", or both.
They should not interfere with Exporting, unless they are used as export plug-ins or the installer changed more in the system than putting the plug-in into the folder.