Aha, had nothing to do with nmh at all. Looks like some cretin changed the default behavior of more so that it looks like less (more or less) and that was the cause of the problem. Adding export MORE='-e' to my .bashrc fixed it, no change to moreproc in .mh_profile needed.
I gues when people are short on ideas they have to break stuff that's been working for eons. Jon