I just upgraded from 7.1 to 7.2. Since that time, I am unable to change Document Types on ANY created page. I get this error in the admin panel:

[KeyNotFoundException: The given key was not present in the dictionary.]
   System.Collections.Generic.Dictionary`2.get_Item(TKey key) +14179127
   System.Collections.ObjectModel.KeyedCollection`2.get_Item(TKey key) +70
   Umbraco.Core.Models.ContentBase.GetValue(String propertyTypeAlias) +32
   Umbraco.Web.UI.Umbraco.Dialogs.ChangeDocType.SavePropertyMappings() +459
   Umbraco.Web.UI.Umbraco.Dialogs.ChangeDocType.ValidateAndSave_Click(Object sender, EventArgs e) +72
   System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +155
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3804

And I get this error in the UmbracoTraceLog:

2014-12-17 15:28:05,707 [32] ERROR Umbraco.Web.Scheduling.ScheduledPublishing - [Thread 17] An error occurred with the scheduled publishing
System.Net.WebException: The remote name could not be resolved: 'sandbox.ramquest.com'
   at System.Net.WebClient.UploadDataInternal(Uri address, String method, Byte[] data, WebRequest& request)
   at System.Net.WebClient.UploadString(Uri address, String method, String data)
   at Umbraco.Web.Scheduling.ScheduledPublishing.Run()

I access the site remotely, however I do have access to the server as well.

Before the upgrade, I could change Document Types ad nauseum. Any idea as to what gives?