GPG Plugin does not recognize multi part encrypted mails

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I wanted to use the GPG function in the Linux version of Mulberry. I did not change any advanced options.

But if "Use MIME Multipart Security with PGP" is checked, Mulberry stops working properly. I chose one encrypted mail in my Sent folder and it shows:

Failed to Verify/Decrypt: Cannot handle type: 'missing protocol parameter'.

I am using kubuntu 6.10. If you want some more debug, tell me what you want.

A screenshot of the error: http://img256.imageshack.us/my.php?image=gpgdk9.jpg

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Screenshot of the error