Well, I contacted ResMed today (one of the nice things about working for a hospital is medical vendors don't think twice when you contact them) to find out what was the issue with this and I found the issue and the fix. The issue is if you have IE9 installed on Win 7 machines (I would assume this would also affect Vista. XP can't run IE9).
Anyhow, the easy fix is as follows. Rollback IE9 to the previous version of Internet Explorer.
1. Open 'Control Panel', go to 'Programs', then 'Programs and Features', 'Uninstall a program'. Alternatively, just type 'appwiz.cpl' into 'Start', 'Search' area and hit Enter.
2. Click on 'View installed updates' link in left sidebar.
3. Click to select and highlight 'Windows Internet Explorer 9', and then right-click on the update and select the 'Uninstall' option. Click OK
4. Restart PC when prompted. After restarting, IE9 will be removed from the system to the previously installed version.
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