Hi there!
Thank you much for the positive feedback, we truly appreciate it.
The error you are seeing is related to the
bug in WCF. We were in talks with Microsoft for a couple of weeks when we discovered the problem, but eventually they decided that this problem does not warrant any kind of quick fix. Hopefully next release of .NET Framework 3.x will address the problem. Until then only ASMX services are supported by UltiDev Cassini.
Best regards,
UltiDev Team.
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http://www.ultidev.com/products/Donate.aspx to help us improve our products.