OK, this NLA thing is pissing me off. I’m satisfied with 5 actions of mine. I view one and click “Push Down” in the action editor to create a strip in the NLA. I type Alt-G and Alt-R to go back to default pose position, bring up a second action (which animates perfectly), push it down. Type Alt-G and Alt-R, bring up a third action and it animates like crap. The photos in the linked gallery are viewed bottom to top:
CAN SOMEONE FOR THE LOVE OF GOD PLEASE HELP?!?
PS the channels for the bones at fault (in this case the hips) have red underlines in the Dope Sheet.
NOTE: SOLVED. I had accidentally renamed a bone. The errors can be corrected in The Graph Editor: Type N for Properties panel, select channel, enter original name in N panel.