1) I was told one device wasn't healthy anymore even though I had a full
scan all links that had completed:
25/03/2013 22:15:49 [Insteon::AllLinkDatabase] Delete orphan links: skipping check for reciprocal links from $gar_outlights_kpl because health: out-of-sync. Please rescan this device!!
2) I had to do sync all links twice after that before it converged
See the full log: http://marc.merlins.org/tmp/print.log-goodsync
25/03/2013 22:14:16 [Sync all links] Starting now!
3) I did a scan all links overnight, and another sync all links, and
3a) it wanted to sync yet more links, even though it was done last night
3b) it failed with
26/03/2013 09:16:02 [Insteon_PLM] WARN: PLM unable to complete requested PLM link table update (update/add responder record) for group: 01 and deviceid: 0fb705
Also, I used my now very long filter of normal messages to find interesting ones
in case they help.