render problem

when I try to export my scene to .mov format the progress bar advance to certain number and then going backward and start from beginning! I’m suspect that the sapphire ofx cause the problem ! plus it take so unusually long to render a scene ! im meeting project deadline in two days and i’m unable to export my project properly .
another problem is exporting to the swf format 3d layers and some other aspect of work dont show at all or dont show correctly in exported file

no body knows? :-/