Hi,
I have done some research and found a working solution (for me).
I have downloaded the latest version 6.1.737.000 (english version).
First I installed just the basic (free) version of ZoneAlarm, no problems there. XE worked just fine.
Then I upgraded to ZoneAlarm Pro and immediately I had the problems as described above.
The problem is definitely due to blocked cookies from localhost.
There are numerous posts on their support forum regarding this issue:
http://forum.zonelabs.org/zonelabs/search?q=cookie+localhost
It seems to be a bug in ZoneAlarm Pro. It identifies the cookies as 3rd party cookies and therefore blocks them. Adding 127.0.0.1, localhost or the local ip address to the site list (privacy tab) won't work either.
The only way I got this working was to set the following configuration options:
Privacy > Cookie Control => OFF
Privacy > Ad Blocking => OFF
Does this workaround work for you as well?
~Dietmar.