I experienced the following problem the other day when trying to configure a WCF-Oracle send portafter installing SP1 for BizTalk 2006 R2. I believe the problem would show itself when using BizTalk Adapter Pack 1.0 as well, but I didn’t verify this.

Here’s a text version of the error:
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WCF-Oracle Transport Properties
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Error loading properties.
(System.MissingMethodException) Method not found: […]