Found part of the culprit, but can't figure out the solution.
in 'fume-rescan-buffer', working modes don't flag the error caught by the
condition-case, i.e.
(setq fnam
(condition-case ()
(funcall find buffer-to-scan)
(error
; reached every time with LaTeX's find routine,
; not reached with C, or Makefile, etc...
(the comments were added by me).
So there is something in fume-find-next-latex-section-name which is
throwing the error. It might be occurring in the code after the initial
let* statement (which extracts the correct function name), but I don't
have time (until tommorow) to figure out where the rest of the bug is,
or what the solution will be. And, it might not (be occurring then).
Sigh...
best,
-tony