Does the project have actual full motion clips on the
Storyboard and Filmstrip? If so, have you tried publishing in
different ways? For example, choosing to target a different Flash
version or turning off compression options?
Where exactly is the project located? (the .CP file) If it's
on a network, try moving it to the local hard drive. If it's
already on the local hard drive, try moving the project to a folder
closer to the root. You may also wish to try closing Captivate and
purging your PC of temporary files. Possibly even try defragging
your hard drive.