I had something similar happen with 5-9-1.? I had several decoders scramble during a session.? While re-configuring with 5-9-1, the decoder would suddenly stop responding during a second compare all.? After this happened to the? seventh or eighth decoder I had begun to suspect JMRI.? I cut my losses and re-installed 5-7-9, and have had no further incidents like that occur on the programing track.? With 5-7-9 I was able to recover all but three of the affected decoders, which are remaining quite stubborn and are still candidates for replacement.
Rick Uhlenkott