Aha! If you hold down the Alt (option) key when launching particleIllusion, it will skip the autoupdate check.
I think that eventually it would have timed out and given you a message. I wonder how long that takes, and why it is not working for you?
If you do a “check for updates” once the program is running does it work, or does it still “lock up”?
How long does it take before it times out?
Do you have any firewall, anti-virus, etc. apps running? If so, what are they?
Alan.
http://www.wondertouch.com