I thought I would give a quick recap of my resolution for admin login described in the following thread:
http://www.zen-cart.com/forum/showthread.php?t=135979
There is a real issue with .htaccess file, need for it in both root of the server and in admin folder and for it to have correct coding so both IE and Firefox and different versions work correctly.
One solution was to add the following code:
# to turn off session-trans-sid
php_value session.use_trans_sid 0
That seems to work when trying to admin site in Firefox (latest version).
I had to clear cache and dump cookies and I was still only able to successfuly login with Firefox occassionally.
The package installs with "Recreate Session" under sessions tab in Admin as "True" When I reset it to false the admin login issue has completely disappeared.
In terms of Internet Explorer browser version 8.0 - with or without .htaccess file in place I'm only able to login once and then can never login again. I'm told by my server admin that there is inherent issue with IE8 with cache/cookies. There is a resolution but nobody seems to know exactly what that is.
As far as comment about web hosting services, this application is hosted on my server where we have dozens of other Zen Cart shopping carts for other customers running so we go to any lengths to support Zen Cart application.
The issue was resolved by adding .htaccess file and turning off "Recreate Sessions" in admin section.
To developers of Zen Cart - please consider adding .htaccess files to download with correct coding for IE as well and turn off "Recreate Sessions" in Admin Setup.
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