I've copied the below from the mitel knowledge base. You should downgrade your browser to ie7 or 6 and then try accessing the web interface. You could also try deleting all temp files and cookies in ie8 and see if that makes any difference.
"It is vital that any user who needs to manage a 3300...
the 700 option in the licence and options section is configurable, you just need to click on change and then select 1200 radial button. Changing this will require a reboot though.
How have you configured the the E2T card on the system? is it set for DHCP or have you given it a static IP...
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