Richard,

>> .... long ago appears to be failing....

I highly doubt that it fails all of a sudden- what did you change?  

If you can not tell- show us the code and I bet that someone will show
you subtle flaw in the code is the cause. In the end it will be "totaly
unrelated"(*) change ---- but with your question it is hard to guess.

(*) Famous phrases when entering the sysprog office: 
"I did not change anything"

>> Does it matter if AMODE is 24 or 31? 

Might want to check POPs- there are numerous instructions that work
different when not in AMODE 24

-- 
Martin Trübner; everything around "PoOps of z/arch"

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