SharePoint 2010- Cant add Users to groups

sharepoint

Okay on my SharePoint server, when i want to grant a user permission to lets say the Owner's group, i go and search for the user in A.D find Him, and when i add him i get this error: Server error in '/'Application..

The same happens when i say select a user to view his permissions in SharePoint, i get the same service, also in IIS i had a look at the accounts that the application pools are using and they are a domain account with the correct rights to connect
to A.D.

In event log this is the event.

Event code: 3005 
Event message: An unhandled exception has occurred. 
Event time: 10/11/2012 10:02:47 AM 
Event time (UTC): 10/11/2012 8:02:47 AM 
Event ID: d902e2fa97c9449aa7b5cc4ed017723b 
Event sequence: 2913 
Event occurrence: 5 
Event detail code: 0 


Application information: 
    Application domain: /LM/W3SVC/1901200390/ROOT-1-129944117181445077 
    Trust level: WSS_Minimal 
    Application Virtual Path: / 
    Application Path: C:\inetpub\wwwroot\wss\VirtualDirectories\80\ 
    Machine name:  

Process information: 
    Process ID: 1000 
    Process name: w3wp.exe 
    Account name: Domain\user

Exception information: 
    Exception type: InvalidOperationException 
    Exception message: There is an error in XML document (1, 43). 

Request information: 
    Request URL: http://www.website.ac.za/_layouts/aclinv.aspx?IsDlg=1 
    Request path: /_layouts/aclinv.aspx 
    User host address:  
    User: 0#.w|Domain\User 
    Is authenticated: True 
    Authentication Type: Federation 
    Thread account name: Domain\User 

Thread information: 
    Thread ID: 26 
    Thread account name: Domain\User
    Is impersonating: False 
    Stack trace:    at System.Xml.Serialization.XmlSerializer.Deserialize(XmlReader xmlReader, String encodingStyle, XmlDeserializationEvents events)
   at System.Xml.Serialization.XmlSerializer.Deserialize(XmlReader xmlReader)
   at Microsoft.SharePoint.WebControls.EntityEditor.ParseSpanData(String spans)
   at Microsoft.SharePoint.WebControls.EntityEditor.LoadPostData(String postDataKey, NameValueCollection values)
   at System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean fBeforeLoad)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)


Custom event details:

Does somebody maybe have a solution for me on this?

Best Answer

For some odd reason, this is related to IE9 (according to http://www.alectang.com/blog/archive/2012/04/24/system-invalidoperationexception--there-is-an-error-in-xml-document.aspx).

I used developer tools (F12) and changed my browser mode to IE8 and it worked around this issue. Doesnt explain why it happens, but allows you to work around it atleast..

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