Do you mind trying the following - in your SystemConfig.config change the <add version="4.1.1339.0" name="Forms" />
line to <remove name="Forms" />
and restart the application. After that change the <remove name="Forms" />
line in SystemConfig.config to <add name="Forms" />
(without specifying the version, it will be added automatically once the application restarts and the module is registered). I hope this information helps. If the problems persist, please do not hesitate to write back.
the Telerik team