Spirithorse,
I'll respond off the board also to male sure you can read this, but for any others with a simliar issue here goes:
I don't know of a specific reason it would be locking up on you, but I can offer some troubleshooting tips that might offer some insight...
The biggest thing would be to disable any add-ons in your browser. Before you do this, if you have more then one browser installed on your computer you may want to just try the site in another browser and see if the same thing happens. If not it is something with your browser's setup. Most of these issues occur because of 3rd party plugins doing something that they shouldn't. If you are using Firefox or Internet Explorer (7 or 8), you can disable all plugins by starting it in safemode (not to be confused with Window's own safe mode).
For Firefox do:
Start >> Run and type:
firefox -safe-mode
For Internet Explorer 7 or 8 do:
Start >> Run and type:
iexplore -extoff
Try the site and see if it gives you the same problems. If so let me know and I can offer some other suggestions.
If you are using Internet Explorer 6, I would *highly* suggest upgrading to Internet Explorer 7. If doing so I would just run
Windows Update to make sure you are up-to-date with all of your Windows patches, as this is the #1 way to prevent viruses and exploits, and often fixes issues like this with Internet Explorer.
--Claudio