Critical system editor doesn't save data when hitting 'Update'

If I define some critical system criteria against a host (or create a template) and hit "Update", the form clears except for the hostname and testname fields. If I then do a "Search" on the hostname/textname data I just entered, it says there are no records. The hostname/testname I entered is not displayed on the Critical Systems View either.

Where are these critical systems records saved? In a file somewhere that I could check manually?

Thanks!