LocalizationKeyNotFoundException
 The specified key [SFSM_PasswordAuthenticationFailed] was not found within the messaging database.
KeyNotFoundException
 The message key [SFSM_PasswordAuthenticationFailed] could not be found in the localization data.

Source     : MicroFour StrataFrame Base

Stack Trace:
(snip)

1. Uninstall SF
2. Delete any SF related registry settings
3. Delete SF related folders:
• C:\Program Files\Common Files\Microfour
• C:\Program Files\Microfour
4. Delete Internet Cache
5. Download and Install SF

I had the messaging and security tables in DDT, so I also:

1. Deleted all messaging and security data packages and tables
2. Re-insert messaging and security data packages and tables
3. Deployed to server

Once I finished this:

1. Opened my project in VS
2. Right-click on the Solution and chose "Clean Solution"
3. Rebuilt the solution

Everything is now peachy...

Keith did the same thing (deleted the tables and packages and let the DDT recreate them) and he is working now, too.