Not sure if you're saying that you still have the problem even after uninstalling ZA 6.
Did this problem happen in another browser?
As it seems to have been the upgrade to ZA that caused this, you could re-install the new version of ZA and then open ZA up and in Program Control, Programs tab, scroll down to Internet Explorer and see what the settings are there.
ZA 6 has more settings as I'm sure you have found out, and maybe one of the security settings for IE is different. I have the following settings on my ZA entry;
SmartDefense = Auto
Trust Level = 3 green bars, (no, I have no idea what this signifies).
Access - Trusted=tick and Internet=tick
Server - Trusted=X and Internet=X
Send Mail = ? (Question mark).
Are your settings any different?
I try to go to Roadrunner's speed test and all I get is Red Xs. My main PC gets the site correctly. This started when I upgraded to ZA Ver. 6, so I uninstalled V 6 and went abck to ver. 5. It appears that all settings in ZA are the same for both PCs but only one shows the site properly.???
Running XP Home/Internet Explorer.