filladapt mode stops filling after lengthy amount of emacs uptime

[John Owens]

Greetings, I've had this filladapt mode problem for several versions
of emacsen, and it hasn't got any better.

Basically when I have an emacs running for a long time (days), 
eventually filladapt just stops working. Restarting emacs always
fixes the problem. The error is below; it beeps and flags "regular
expression too big" when I go past 70-something characters in a line
in mail mode (for instance). I am running the most recent Carbon Emacs
version of emacs, 22.0.92.1, on OS X (PPC) 10.4.9.

Anything I can do to help debugging?

JDO

Debugger entered--Lisp error: (invalid-regexp "Regular expression too big")
  looking-at( ... )
  fill-nobreak-p()
  fill-move-to-break-point(279)
  #[nil "[big long complex string]‡" [fill-prefix give-up justify fc
auto-fill-inhibit-regexp adaptive-fill-mode nil current-justification
current-fill-column left beginning-of-line looking-at (full center right)
unjustify-current-line "" fill-context-prefix backward-paragraph 1
forward-paragraph string-match "\\`[    ]*\\'" regexp-quote 0 move-to-column
fill-move-to-break-point " " re-search-forward t "      " justify-current-line
prefix fill-indent-according-to-mode after-prefix fill-point comment-start-skip
limit prev-column comment-line-break-function] 5] nil)
  filladapt-funcall(do-auto-fill)
  byte-code("ƒ[bytecode]" [filladapt-mode fill-prefix retval
filladapt-inside-filladapt comment-multi-line adaptive-fill-regexp nil t
filladapt-adapt filladapt-funcall do-auto-fill throw done adaptive-fill-mode
paragraph-ignore-fill-prefix] 7)
  do-auto-fill()
  mail-mode-auto-fill()