Hi Andrew,
Thanks for your post and Cris's input.
The "Loading" issue may be caused by many factors. In addition, you may also have a look at KB280823 which covers most of the scenarios.
Troubleshooting OWA when the contents frame displays "Loading"
http://support.microsoft.com/default.aspx?scid=kb;en-us;280823
Users receive a "Loading" message when they use OWA to access their mailbox after you apply a hotfix or a service pack to Exchange Server 2003
http://support.microsoft.com/kb/910119/en
Hope this helps.
Best regards,
Robbin Meng(MSFT)
Microsoft Online Newsgroup Support
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