While logged in as the System Administrator and editing a contact, I see the option to change the contact's record type. I click the change link and a new screen is displayed allowing me to choose a new record type. I select the new record type from the list and click Save.
The edit screen is displayed again but the record type hasn't be changed. No error or warning message is displayed at any time. Disabling every trigger to eliminate any potential conflict hasn't helped. From the Developer's Console, I am able to change the record type, just not from the web user interface.
What could be causing this issue?