Correlation and Int64 context properties

This might be another undocumented (?) restriction in BizTalk 2006 -

If you try to initialize a correlation set that uses a context property of type Int64 you get an "ArgumentOutOfRangeException" with an error similiar to this - "Index and length must refer to a location within the string."

I've created a small test case I'm uploading which has three correlation sets defined - one uses a string property, one uses an Int32 and one uses an Int64.
the first two work fine, but as soon as I select the third one to be intialized as well I get the error mentioned. I am running on a windows 2003 server.

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