You can try to use SU7 for this...

Yes, please post your model, or at least some adequate screenshots. Have you checked if Edges are activated in your View menu?

@dale said: If I remember correctly, when you turn on hidden geometry, you can click on the hidden geometry in question and drill back down into the group and unhide it. Can anyone concur? i concur

The string 'book' does not occur in Slicer.rb code OR any of its loaded code later. So something that was loaded just before is corrupting the load. What other things are loading ??? [Unless you have edited the Slicer script with a word-processor and formated it, thereby breaking it, it has to be something breaking earlier...]