One more bit of information...

Using this link:

http://social.msdn.microsoft.com/forums/sqlserver/en-US/04bce059-5a37-41bd-a813-a3f24fd359c6/passing-arguments-to-execute-process-task-in-ssis-2005

The Standard Output variable is telling me:

User::StdOutput{\r\rRecipients' public key(s) will be used to encrypt.\r\rCannot find the public key matching userid 'user'\rThis user will not be able to decrypt this message.\r\aEncryption error\r\rFor a usage summary, type: pgp -h\rFor more detailed help, consult the PGP User's Guide.\r}String

Does this mean that our client changed something on their end?