Updated a skin version on one of the portals in the install.  No other portals were affected in the installation.  Everything appears to work OK except for a few admin pages (site settings, page mgmt, etc) and I get the Critical Error box and the following event log error:

DotNetNuke.Services.Exceptions.PageLoadException: An item with the same key has already been added. ---> System.ArgumentException: An item with the same key has already been added.    at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)    at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)    at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable`1 source, Func`2 keySelector, Func`2 elementSelector, IEqualityComparer`1 comparer)    at DotNetNuke.Web.UI.WebControls.DnnSkinComboBox.OnLoad(EventArgs e)    at System.Web.UI.Control.LoadRecursive()    at System.Web.UI.Control.LoadRecursive()    at System.Web.UI.Control.LoadRecursive()    at System.Web.UI.Control.LoadRecursive()    at System.Web.UI.Control.LoadRecursive()    at System.Web.UI.Control.LoadRecursive()    at System.Web.UI.Control.LoadRecursive()    at System.Web.UI.Control.LoadRecursive()    at System.Web.UI.Control.LoadRecursive()    at System.Web.UI.Control.LoadRecursive()    at System.Web.UI.Control.LoadRecursive()    at System.Web.UI.Control.LoadRecursive()    at System.Web.UI.Control.LoadRecursive()    at System.Web.UI.Control.LoadRecursive()    at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)    --- End of inner exception stack trace ---