Well, I think that Francis is the main person behind the pleiades port, but I don't have read access to all of his files, and he's in the CCWG meeting all day today. So let's see if he has anything once he gets back.The problem we usually have with pleiades is that its modules (and to a lesser extent, hardware) are updated relatively frequently, whereas the main projects we support on pleiades don't create builds for new runs as often. Hence the CESM releases tend to get out of date rather easily. I doubt that earlier CESM versions will do any better than CESM 1.2.1, since the problem is usually a machine change, not a CESM change. However, you can also try to figure this out yourself by talking to NAS support and/or doing your own trial and error.