If you're comfortable with the Terminal application, you can use the following command to turn off the automatic update checking, which is what's causing the hang upon launching Stuffit Expander (Allume's site is down). Launch the Terminal application (in the /Applications/Utilities/ folder), type the following at the prompt, and hit enter (disregard the "code :" line):
code:
defaults write com.stuffit.Expander allowVersionChecking -bool NO
Then try launching Stuffit Expander and see if it does okay.
Hope this helps....