I have an iMac, Processor: 2.7 GHz Intel Core i5, memory: 8 GB 1333 MHz DDR3, OSX 10.7.5, FCPX 10.0.8. I have no third party plugins. First time responding to community. Forgive any protocol errors.
Been working on variety of work projects for months prior to update with no problems. Took time off for a simple new project after updating to 10.0.8. Finished this small (11 minute) new project that is a combination of video and stills, with a few titles and simple transitions. Plays fine within FCPX, however, ran into same problem that started this chain, ie cannot share/export without getting same error message stated above related to a faulty frame.
Tried several share/export Master File settings. Tried moving project (from within FCPX) to another drive which resulted in same error message, but related to other different frames. Tried replacing original data in affected frame with freshly exported replacement files using QTime. Same problem again. Was able to export to Compressor, but resulting ProRes 422 file was so jumpy it wasn't usable.
Tried suggestions of Mark M 98021 and Hank LV, ie, halting all rendering in preferences and deleting render files. After this, I was successful in sharing/exporting at will.
I have several other major projects that I am afraid to return to. I'm not an expert at the inner workings of FCPX and don't have time to keep dealing with this issue. I can leave rendering off, but not a satisfactory solution. Not sure if old rendered files might become infected.
It would seem that there is a problem in the update. I hope this is corrected so I can continue with my work.