Hi Matt,
Could you please confirm a few things:
1) Did you or anyone else changed any of your system settings liek date/time or any installed/removed any component.
2) Was this project created in Cp7 from scratch or did someone share this project with you, when was this Project created and published. If a project is created with a trial version of Captivate it would expire after 30 days from its published date.
3) As a test can you create another sample project and publish it and check iof you encounter any problem with it -- Crash/Hang/Freeze/Expiry
Thanks,
Anjaneai