I have faced issue with regards to Unisphere i.e after entering the URL the browser shows blank page . Below were the various resolution steps for me :-

• Allow the Unisphere URL in the browser as trusted site.
• Make sure correct Java and Flash version is installed.
• Make sure that ports of any other software like DCNM are not conflicting with Unisphere .
• There was weird situation wherein if Unisphere was installed in D it didnt worked whereas after installation in C it worked .