Has anyone got this error when loading edit mode?

[NullReferenceException: Object reference not set to an instance of an object.]
   at EPiServer.Shell.Storage.PersonalizedViewSettingsStorage.ConvertComponentDataToIComponent(ComponentData source, IPrincipal principal)
   at EPiServer.Shell.Storage.PersonalizedViewSettingsStorage.ConvertDataContainersToIContainer(IEnumerable`1 source, IList`1 destination, IPrincipal principal)
   at EPiServer.Shell.Storage.PersonalizedViewSettingsStorage.ConvertToPersonalizedViewSettings(IPrincipal principal)
   at EPiServer.Shell.ViewComposition.PersonalizationViewTransformer.TransformView(ICompositeView view, IPrincipal principal)
   at EPiServer.Shell.ViewComposition.DefaultViewManager.GetView(String viewName, IPrincipal principal)
   at EPiServer.Shell.UI.Bootstrapper.CreateViewModel(String viewName, ControllerContext context, String moduleName)
   at EPiServer.Shell.UI.Controllers.EPiHomeController.Index(String language)
   at lambda_method(Closure , ControllerBase , Object[] )
   at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters)
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
   at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass13.b__10()
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation)
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodWithFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
   at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName)
   at System.Web.Mvc.Controller.ExecuteCore()
   at System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext)
   at EPiServer.Shell.Web.Mvc.ModuleMvcHandler.ProcessController(IController controller)
   at EPiServer.Shell.Web.Mvc.ModuleMvcHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object state)
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)


We have been installing/uninstalling some Add-ons, but now they are not there, no dlls, nothing in modules or modulerepositories.

Admin mode works normally, we are using MultiplexingMembershipProvider.