[emacs][bug]freezes typing "border:" in .css file

[ishi soichi]

hi.  I am not sure if this is a bug.  Maybe it is due to the settings of my emacs.

When typing "border: " in CSS file (of course, the emacs is in css-mode), emacs freezes itself.  And this happens EVERYTIME!

I am not sure what to provide as the background information other than the phenomenon described above, here is my environment.

Cocoa Emacs Version 23.2 (9.0)

MacOS Snow Leopard 10.6.4

installed elisps:

----------------------------

auto-install.el

emacs-w3m

auto-save-buffers

skk (Japanese input method)

anything.el

auto-async-byte-compile.el

auto-complete-config.el

auto-complete.el

color-theme.el

color-theme-autoloads.el

fuzzy.el

html-fold.el

ipa.el

key-chord.el

popup.el

sense-region.el

sequential-command.el

text-translator.el

shell-pop.el

twittering-mode.el

w3m-wget.el

---------------------------

When typing "border: ", auto-complete reacts instantaneously.  If it is a bug or an interference, that can be the problem.

Thanks in advance for your help.

Soichi