Apple is the problem .
There is NO version of Quicktime, built for 64 bit systems.
and Apple, seem to be dragging their heels on any development,. while apparently focusing on the latest mini teeny weeny “I bollox” which nobody needed in the first place.
The 32bit version is all there is.
As far as Carrara is concerned,. it’s a PITA if you’re regularly exporting draft stuff as Quicktime,. but,.. as they say,.. Other products are also available.
One good thing is that you get BOTH the 64 bit and 32 bit versions of Carrara 8 pro. So,. you can create a scene in the 64bit version, then save it,. load it into the 32 bit version and render as quicktime.
It’s better, and safer, to export your animations as “Sequenced image files” like individual (frames of film).
Any good Video editor, can load a numbered sequence of images, as a “clip” and export that in whatever final format you need.