LDAP: Assign Privilages, Enable LDAP Authentication - Broken WebSite

I get this error immediately after assigning privilages from our AD and enabling LDAP Authentication.
What am I doing wrong, I have uninstalled Proget several times to start with Basic Built in Rights and Users, try converting to LDAP and same issue everytime.
My Re-install have been on clean system, each time (No Folders, No Database, No WebSite)

Server Error in '/' Application.

Value cannot be null.
Parameter name: value
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentNullException: Value cannot be null.
Parameter name: value

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[ArgumentNullException: Value cannot be null.
Parameter name: value]
System.Web.Caching.CacheEntry..ctor(String key, Object value, CacheDependency dependency, CacheItemRemovedCallback onRemovedHandler, DateTime utcAbsoluteExpiration, TimeSpan slidingExpiration, CacheItemPriority priority, Boolean isPublic) +12788234
System.Web.Caching.CacheInternal.DoInsert(Boolean isPublic, String key, Object value, CacheDependency dependencies, DateTime utcAbsoluteExpiration, TimeSpan slidingExpiration, CacheItemPriority priority, CacheItemRemovedCallback onRemoveCallback, Boolean replace) +144
System.Web.Caching.Cache.Add(String key, Object value, CacheDependency dependencies, DateTime absoluteExpiration, TimeSpan slidingExpiration, CacheItemPriority priority, CacheItemRemovedCallback onRemoveCallback) +378
Inedo.ProGet.WebApplication.ProGetHttpModule.LoadUserFromCache(HttpApplication app) +745
Inedo.ProGet.WebApplication.ProGetHttpModule.AuthorizeRequest(HttpApplication app) +162
System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +80
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +165

Product: ProGet
Version: 2.2.9