If you choose the top level Permissions and then select any permission from the right pane "All Permissions" view.  You get the error displayed below, I also got the same error running form the RBS Sample.

Exception
  Could not create permission editor.

Source     : MicroFour StrataFrame Security

Stack Trace:
   at MicroFour.StrataFrame.Security.SecurityDialog.CreatePermissionForm(Int32 ProjectPK, Int32 ItemPK, String Category, Boolean IsCopy)
   at MicroFour.StrataFrame.Security.SecurityDialog.EditPermission()
   at MicroFour.StrataFrame.Security.SecurityDialog.lvDetail_DoubleClick(Object sender, EventArgs e)
   at System.Windows.Forms.Control.OnDoubleClick(EventArgs e)
   at System.Windows.Forms.ListView.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativewindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativewindow.WndProc(Message& m)
   at System.Windows.Forms.Nativewindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

You are probably trying to edit a permission at runtime, is that so?

If this is the case, permissions are not supposed to be edited at runtime, only at design time. This exception will probably be treated differently in the future.

Cheers.

I was only trying to view the premission.  Trent I emailed a snap shot of the screen.   I even was able to recreate the error form the StrataFrame RBS sample.   

To recreate error, just click on the Permissions group in the left frame and click on any premission key in the right frame and you will get the  error.

I have just run the sample over here to check it, and it does show the error, but only if I "double click" the permission, which is the action to Edit it. If I only click on it, it just gets selected. And as you already know, Permissions are not supposed to be edited at runtime.