As announced before on our website, the 6.2.2 release which is expected to be released later this week will provide compatibility to MS Silverlight RC0/RTW.
As you probably know, Microsoft recently released a new version of Silverlight which provides almost no compatibility backwards to older Silverlight versions. This means that all the released VWG Silverlight applications will not work with this new MS Silverlight version.
Furthermore, Microsoft triggered an automatic update mechanism inside Internet Explorer to have the Silverlight ActiveX update without asking. As a result, all computers with MS Silverlight client installed on it have the new version, unless the user manually removed it.
Since Microsoft released this incompatible version, our Silverlight development team has been working very hard on modifying Visual WebGui to get in line with those changes and support the new MS version once again. We were also promised by Microsoft director in Silverlight group that this was the last back compatibility breaking.