Found a problem with Articulate and U7.4.1 (I know its not a supported version but I did an upgrade and I thought everything was working fine, obviously missed this bit when testing).

When I try and access the document type 'Articulate Post' or 'Markdown' or 'Rich Text' I get the error below. Not sure where to start to try and fix it.

It's strange though because I can still post blog posts, make new blogs etc, it's just when I try and go in to the document type it errors.

 An error occured



     Mapping types:
     ContentType -> IEnumerable`1
     Umbraco.Core.Models.ContentType -> System.Collections.Generic.IEnumerable`1[[Umbraco.Web.Models.ContentEditing.PropertyGroupDisplay`1[[Umbraco.Web.Models.ContentEditing.PropertyTypeDisplay, umbraco, Version=1.0.5891.23243, Culture=neutral, PublicKeyToken=null]], umbraco, Version=1.0.5891.23243, Culture=neutral, PublicKeyToken=null]]

     Destination path:
     DocumentTypeDisplay.Groups.Groups

     Source value:
     Umbraco.Core.Models.ContentType

    EXCEPTION DETAILS

    AutoMapper.AutoMapperMappingException: 

     Mapping types:
     ContentType -> IEnumerable`1
     Umbraco.Core.Models.ContentType -> System.Collections.Generic.IEnumerable`1[[Umbraco.Web.Models.ContentEditing.PropertyGroupDisplay`1[[Umbraco.Web.Models.ContentEditing.PropertyTypeDisplay, umbraco, Version=1.0.5891.23243, Culture=neutral, PublicKeyToken=null]], umbraco, Version=1.0.5891.23243, Culture=neutral, PublicKeyToken=null]]

     Destination path:
     DocumentTypeDisplay.Groups.Groups

     Source value:
     Umbraco.Core.Models.ContentType