Please note, that the new version of firefox is causing issues with home access plus+. This issue only effects the silverlight version of the my computer browser, and the default uploader.
To fix the problem, either downgrade to 3.6.3 or:
- Type “about:config” into FF’s address bar
- Accept the warning (if applicable)
- Search for the entry “dom.ipc.plugins.enabled.npctrl.dll”
- Change its value from “true” to “false” (double-click)
- Restart the browser
I have filed a bug report with Mozilla about this, and so has a fair few other people, as this is a big issue.