Thanks for the tip.

Like Mark Bremmer, I have fallen fowl to outputting to quicktime in the past and now always output as sequenced images, then use a free image stacker (Time Laspe Assember) to create the quicktime file. Works a treat.

The main problem I constatly run into is after saving a 2gb+ CAR scene on my iMac, and then reopening, Carrara nearly always reports a 'Not my file type while executing open' error. It drives me mad and I have lost so much work !!