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I've committed a change to the cvs that may fix this. I've 
switched to using binascii.[a2b|b2a]_base64 and am using 
strip() instead of [:-1]. I tested with:

>>> import binascii
>>> binascii.a2b_base64(binascii.b2a_base64('a'))
'a'
>>> binascii.a2b_base64(binascii.b2a_base64('ab'))
'ab'
>>> binascii.a2b_base64(binascii.b2a_base64('abc'))
'abc'
>>> binascii.a2b_base64(binascii.b2a_base64('abcd'))
'abcd'


so if it still breaks, there's something else doing a 
truncation of the data.