Sorry to come in very late, but could this be related to the RFM firmware / Jeelib changes that I had a problem with in the emonSD forum? V2.6 is “bad” and revertiung to V2.5 restores the connection - I also continued to see the emonTH input fine.
See emonSD-03May16 Release - #35 by peter
Actually, re-reading the original post this is exactly the same issue. Downgrade the emonbase/RFM firmware from 2.6 and you will be back.