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I'm having the same problem, though I expect for a different reason. I'm working my way through learning ArcGIS and probably have done some things in a not correctl way. Here's a clip of my ToC for this map. I want to group symbol layers by trip [GWTrip1-Point, GWTrip1-Line]. When I try any of the methods described in the ArcGIS help file under "Working with group layers", none work. No messages are returned, no actions appear to be taken. I would be very grateful to know what I'm doing wrong and how to fix it.
Thank you very much ...