This is really strange. Out of the blue I'm getting several "Unknown server tag" messages in \Sitefinity\Admin\Admin.master and Admin\CmsAdmin\ChangeRecepients.aspx.
I have not touched either of these files, nor have I applied any patches.
ChangeRecepeints is missing:
Admin.master is missing telerik:RadTabStrip.
With Admin.master not compiling, the administration side of Sitefinity is no longer accessible.
Also, I do not see any of these controls in the General section of the Toolbox, though the rest of the RadControls are there.
Aren't these controls part of this assembly:
|<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>
Any other ideas on getting this working again? My development is essentially at a standstill.