Hi Paul,
If you’re using the latest master of GitHub - COSIMA/01deg_jra55_ryf: 0.1 degree ACCESS-OM2 experiment with JRA55 RYF atmospheric forcing., then the problem is probably the forcing versions - you’re trying to intialize a JRA55-do v1.4 from a JRA55-do v1.3 restart. If you want to use that restart, you’d want to use the v1.3 forcing, which I think is in this branch: GitHub - COSIMA/01deg_jra55_ryf at 01deg_jra55v13_ryf9091.
We have collected some information on standard COSIMA control runs on this forum: ACCESS-OM2 Control Runs