ArgumentOutOfRangeException while trying to Edit Pages and T

Getting a strange exception when trying to edit Pages and Templates.

Exception information: 
    Exception type: ArgumentOutOfRangeException 
    Exception message: Type is enhanced and registered, but not available from the database class meta data. This can be caused by a wrong connection id or configuration.
Parameter name: type
Actual value was Telerik.Sitefinity.Personalization.Impl.Model.Segment.
   at DynamicModule.ns.Wrapped_OpenAccessPersonalizationDataProvider_b6a447b057874e9bb4920c6607ab78a9.GetSegments()
   at Telerik.Sitefinity.Personalization.Impl.PersonalizationManager.GetSegments(Guid siteId)
   at Telerik.Sitefinity.Personalization.Impl.PersonalizationManager.GetSegments()
   at Telerik.Sitefinity.Personalization.Impl.PersonalizationManager.GetUsedSegmentsForPage(Guid personalizationMasterId, PageManager pageManager)
   at Telerik.Sitefinity.Personalization.Impl.Web.UI.Pages.PersonalizedPageSelector.InitializeControls(GenericContainer container)
   at Telerik.Sitefinity.Web.UI.SimpleView.CreateChildControls()
   at System.Web.UI.Control.EnsureChildControls()
   at System.Web.UI.Control.PreRenderRecursiveInternal()
   at System.Web.UI.Control.PreRenderRecursiveInternal()
   at System.Web.UI.Control.PreRenderRecursiveInternal()
   at System.Web.UI.Control.PreRenderRecursiveInternal()
   at System.Web.UI.Control.PreRenderRecursiveInternal()
   at System.Web.UI.Control.PreRenderRecursiveInternal()
   at System.Web.UI.Control.PreRenderRecursiveInternal()
   at System.Web.UI.Control.PreRenderRecursiveInternal()
   at System.Web.UI.Control.PreRenderRecursiveInternal()
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

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Help would be appreciated as soon as possible.

Thanks

AJ