Just to update everyone on my issue, the original was locked for some reason.
Well, I finally found time to try the suggested installation steps from ZoneAlarm tech support (outlined in the other thread) and the problem remains.
I have two login accounts on my Windows Vista Home Premium 32-bit PC. On one account the control center is fine, on the other all I see is a blank window.
Both accounts are listed as Administrator accounts but it has to be a permissions issue. One account was the default created during windows installation and the other was added after. That is the only difference between the two accounts.
Operating System:Windows Vista Home Premium
Product Name:ZoneAlarm Internet Security Suite