SqlException (0x80131904): Invalid column name 'FullName'.
This is how the error occurred: I created my EF data model, dropped the database, added 'FullName' to one of my tables, and updated my data model.
Clearly EF lost a mapping or some DB specific configuration setting. I poked around the web for a while and could not find the exact cause. Some claims point towards schema types or collation settings.
Unfortunately, I don't have the time to figure this one out, so I removed my EF data model and its connection strings in the app.config and recreated it. This resolved the issue, but I have that uneasy feeling this is going to come back to bite me again.