What is your SAP MII version?
While loading webpage, is it showing contentiously loading and not opening content, then its 100% java issue only.
Goto IE9-->Tools-->internet options --> Advanced --> Browsing check(Disable script debugging). Once you down this, on status bar its shows the error like 'undefined object'.
To correct it, you need to upgrade or degrade java version accordingly.
Mine is Window 7 and using Java version 1.7.0_13-b20. its working fine.
Regards,
Praveen Reddy
