FireFox 4 won't open our web app anymore?

Hi.
I notice that FireFox 4 won't load our web app.
When I view the source it is blank?
It's fine in FF 3, IE and Chrome

4.0 needs 10.5 and an Intel processor. <br />
http://www.mozilla.com/en-US/firefox/4.0/system-requirements/
For older Macs that aren't supported in Firefox 4.0, try TenFourFox for PowerPC's running Mac 10.4.11 & 10.5.8 . <br />
http://www.floodgap.com/software/tenfourfox/

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FireFox 4 won't open our web app anymore?

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