The problem is that when deactivating "Never Review" or "Never Auto Expire" the date drop-down boxes are not activated - only the time input fields. Thus, the date parameters are missing in the request.
This results in an unhandled exception in the case of the review date and in a handled input error in the case of expiration date.
Activating the date fields using Firebug works around the problem.
Steps to reproduce:
- Control Panel -> Web Content -> Add Web Content
- Enter name and content
- Deactivate "Never Review"
- Click "Publish"