Question On Restoring Encrypted Databases On Different Servers

I have run into problems trying to use backed-up encrypted databases. I have an ASP.Net/SqlServer 2005 website for which I have production, test, and development environments, each on its own box. I have set up encryption using Master Keys, Certificates, and Symmetric Keys using the following commands:

CREATE MASTER KEY ENCRYPTION BY PASSWORD = 'password'

CREATE CERTIFICATE CERTIFICATE_NAME WITH SUBJECT = 'My Website'

CREATE SYMMETRIC KEY KEY_NAME WITH ALGORITHM = TRIPLE_DES ENCRYPTION BY CERTIFICATE CERTIFICATE_NAME.

All databases have the same certificate and symmetric key names. The Production database has a different password than the development and test databases.

I am running into problems when I back up the development database and try to move it to the test environment. When I do the move, and then try to access the encrypted data, I get an error "An error occurred during decryption", even though they are the "same" database (I originally detached and copied the development database to the test box when I set up the test environment) with the same password.

I then try the following commands, which I used when I brought the development database over to the test box the first time:

OPEN MASTER KEY DECRYPTION BY PASSWORD = 'password'

ALTER MASTER KEY REGENERATE WITH ENCRYPTION BY PASSWORD = 'password'

This caused the following error:
"An error occurred while decrypting certificate 'CERTIFICATE_NAME' that was encrypted by the old master key. The FORCE option can be used to ignore this error and continue the operation, but data that cannot be decrypted by the old master key will become unavailable."

So, how do you set up encrypted databases so that you can backup from one database server and restore on another? This problem will be very important when I set up a backup production database server.