rsa encrtyption

I created a key for encrypting my web.config

aspnet_regiis -pz WebEncryptionKeys
aspnet_regiis -pc WebEncryptionKeys -exp

exported them
aspnet_regiis -px WebEncryptionKeys c:\WebEncryptionKeys_Public.xml -pri

imported them to developers and server machines
aspnet_regiis -pi "WebEncryptionKeys" "c:\WebEncryptionKeys_Public.xml "


Then in MsBuild I run
<Target Name="AfterBuild">
<Exec WorkingDirectory="$(OutputPath)"
Command="$(Registry:HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSBuild\ToolsVersions\2.0@MSBuildToolsPath)aspnet_regiis.exe
-pef connectionStrings $(OutputPath) -prov HrCustomProvider" />

This works fine from my machine, the web.config gets encrypted and moved to
the server.
However, if a co-worker runs the same msBuild on her machine, we get a bad
data error when the website is hit on the server. If I deploy to the server,
she can logon to the server and encrypt and decrpyt the web.config.

I re-imported the encryption keys to her machine with the same results.

The only thing I can think of is that her machine is using a different
version of the encrtyption algorithims?

So I had her run windows update on her machine, couple things got updated
sql server mostly.

I logged on to her machine, deployment worked.
She logged on to her machine, deployment worked.

The keys were created months ago. Any idea what happened?

.

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