Rocky Lhotka published alpha version of CSLA 4.3 last week. You can read more about the changes on his blog. If you are using CSLA 4.X with Silverlight, please give this version a try. If you are using an order version, 3.8.X, you can easily port the changes over to that version. Or you can just upgrade to 4.3 .
Please let me know if you have any questions.