gdb not displaying frame info after a "next"

My Linux gdb (8.1 or 7.anything) is no longer automatically showing the frame information after

a "next".   It knows the frame information; if I follow every "next"

with a "frame", the "frame" command does the right thing, but "next"

all by itself does not print anything but a fresh (gdb) prompt.

Googling has found me no one else who has ever encountered this as far

as my Googling skills can tell.



How can I debug what the cause and solution is?