Indexcontent.aspx throwing permissions error on latest version

While setting up Search on a v11 instance, I noticed that clicking "Index content" in the admin section throws a permissions error. There was one other forum post which hinted at the admin role being the cause of the issue, but I'm not really doing anything crazy for mapped roles. Just one named AD group and thats it.

Edit --> I should add that Im currently using ADFS for authentication, dont know if that matters. 

Has anyone else ran across this before? Below is the detailed error

The assembly or AppDomain that failed was:
mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
System.Security.SecurityException: Request for principal permission failed.
   at System.Security.Permissions.PrincipalPermission.ThrowSecurityException()
   at System.Security.Permissions.PrincipalPermission.Demand()
   at System.Security.PermissionSet.DemandNonCAS()
   at EPiServer.UI.Admin.IndexContent..ctor()
   at ASP.episerver_episerver_search_cms_indexcontent_aspx..ctor() in c:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\61a7374b\1e1d9993\App_Web_nea3ffuq.0.cs:line 0
   at __ASP.FastObjectFactory_app_web_nea3ffuq.Create_ASP_episerver_episerver_search_cms_indexcontent_aspx() in c:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\61a7374b\1e1d9993\App_Web_nea3ffuq.1.cs:line 0
   at System.Web.Compilation.BuildManager.CreateInstanceFromVirtualPath(VirtualPath virtualPath, Type requiredBaseType, HttpContext context, Boolean allowCrossApp)
   at System.Web.UI.PageHandlerFactory.GetHandlerHelper(HttpContext context, String requestType, VirtualPath virtualPath, String physicalPath)
   at System.Web.HttpApplication.MaterializeHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
The action that failed was:
Demand
The type of the first permission that failed was:
System.Security.Permissions.PrincipalPermission
The first permission that failed was:<IPermission class="System.Security.Permissions.PrincipalPermission, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
version="1"><Identity Authenticated="true"
Role="WebAdmins"/><Identity Authenticated="true"
Role="Administrators"/></IPermission>
The demand was for:<IPermission class="System.Security.Permissions.PrincipalPermission, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
version="1"><Identity Authenticated="true"
Role="WebAdmins"/><Identity Authenticated="true"
Role="Administrators"/></IPermission>