Don't recall seeing anything on this, so:

Trying the new MPE  LISTF x,8  and  LISTF x,9 functions.
Works great in MPE (thank you, Jeff Vance):

[1] ECS.XXXX:listf dbecs,8
********************
FILE: DBECS.ECS.XXXX
13 Accessors(O:13,P:13,L:0,W:12,R:13),Share
#S460   FFFF,AB.XXXX    P:1,L:0,W:1,R:1   REM :   ...[SNIP]

HOWEVER:  Trying same in MPEX:

[1] ECS.XXXX:mpex
MPEX/3000  26N70813  (c) VESOFT Inc, 1980  5.5  03:02330  For help type
'HELP'

%listf dbecs,8
Error: Bad %LISTF mode.
%

I called VESOFT, and was told 26N70813 is the latest version.
Obviously the work-around here is trivial:  Exit MPEX and do
the new LISTF stuff in MPE.

But it made me wonder:  Are there any known problems out
there with new MPE functions that MPEX does not recognize
yet, that might actually been "dangerous" when running MPEX
??

Just wondering.....
Ken Sletten