After the update to 7.3 I get an error when i want to edit the page settings, adding an new page or I want to edit module setting. 

Critical error: object reference not set to an instance of an object

I don't get the error when I want to edit an SuperUser pages

Some one registered it already here:

DNN-5467

in the log file I get the following error:

2014-06-22 09:22:13,305 [node2][Thread:57][FATAL] DotNetNuke.Framework.PageBase - An error has occurred while loading page.
System.NullReferenceException: Object reference not set to an instance of an object.
at DotNetNuke.Security.Permissions.Controls.PermissionsGrid.<>c__DisplayClass1.b__0(RoleInfo r)
at System.Linq.Enumerable.All[TSource](IEnumerable`1 source, Func`2 predicate)
at DotNetNuke.Security.Permissions.Controls.PermissionsGrid.EnsureRole(RoleInfo role)
at DotNetNuke.Security.Permissions.Controls.PermissionsGrid.GetRoles()
at DotNetNuke.Security.Permissions.Controls.PermissionsGrid.BindRolesGrid()
at DotNetNuke.Security.Permissions.Controls.PermissionsGrid.BindData()
at DotNetNuke.Security.Permissions.Controls.PermissionsGrid.OnPreRender(EventArgs e)
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.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)
2014-06-22 09:22:13,320 [node2][Thread:57][ERROR] DotNetNuke.Services.Exceptions.Exceptions - ~/Default.aspx?tabid=56&error=Object+reference+not+set+to+an+instance+of+an+object.
System.NullReferenceException: Object reference not set to an instance of an object.
at DotNetNuke.Security.Permissions.Controls.PermissionsGrid.<>c__DisplayClass1.b__0(RoleInfo r)
at System.Linq.Enumerable.All[TSource](IEnumerable`1 source, Func`2 predicate)
at DotNetNuke.Security.Permissions.Controls.PermissionsGrid.EnsureRole(RoleInfo role)
at DotNetNuke.Security.Permissions.Controls.PermissionsGrid.GetRoles()
at DotNetNuke.Security.Permissions.Controls.PermissionsGrid.BindRolesGrid()
at DotNetNuke.Security.Permissions.Controls.PermissionsGrid.BindData()
at DotNetNuke.Security.Permissions.Controls.PermissionsGrid.OnPreRender(EventArgs e)
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.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)