Interfering fontification in C?

[Douglas "Local Deity" Lewan]

All,

On occasion, C-mode gets into a bad fontification state for me.
With every keystroke, I'll get an error like the following.

  font-lock-fontify-keywords-region(162 687 nil)
  font-lock-default-fontify-region(162 663 nil)
  font-lock-fontify-region(162 663)
  run-hook-with-args(font-lock-fontify-region 162 663)
  jit-lock-fontify-now(162 662)
  jit-lock-function(162)
  sit-for(0.125)
  jit-lock-stealth-fontify()
  apply(jit-lock-stealth-fontify nil)
  byte-code("...." [timer apply 5 6] 4)
  timer-event-handler([t 0 3 0 3 jit-lock-stealth-fontify nil t])

There are also errors that claim emacs has tried something like

  (font-lock-fontify-region (match-beginning 5)
                            (match-end 1))

which seems pretty darned odd to me.  (Sorry if I've got the
real error here wrong.  It happens inside an (eval) and I'm
not seeing it at the moment.)

Can anyone one help me understand what's going on?  Or fix it?
Or avoid it?

-- 
,Doug
Douglas Lewan
d_lewan2000@yahoo.com

    Logic: The art of being wrong with confidence...