I keep posting for info on this, but thus far no one has an answer so I will keep asking as I can't figure it out. Someone, anyone...?

I've had several customers (using IE and Mozilla) create accounts and be unable to see the 'My Account' link. Therefore they assume they aren't logged in and keep logging in. I can see this happening in the admin area where customers are logging in 21 times in less than an hour. Personally I would quit way before then. I know we are losing business! I'm running 1.3.9d, domain is hoopclothes.com

I've done some digging around in the forums, but haven't found any exact references to this problem. I found some references to the config files so if this is helpful here are portions of them:
includes>config -
define('HTTP_SERVER', 'http://www.hoopclothes.com');
define('HTTPS_SERVER', 'https://www.hoopclothes.com');

// Use secure webserver for checkout procedure?
define('ENABLE_SSL', 'false');

AND admin>includes>config
define('HTTP_SERVER', 'http://hoopclothes.com');
define('HTTPS_SERVER', 'https://hoopclothes.com');
define('HTTP_CATALOG_SERVER', 'http://hoopclothes.com');
define('HTTPS_CATALOG_SERVER', 'https://hoopclothes.com');

// Use secure webserver for catalog module and/or admin areas?
define('ENABLE_SSL_CATALOG', 'false');
define('ENABLE_SSL_ADMIN', 'false');

I also found a few references to something about setting Configuration>Sessions>Recreate Sessions to false. I haven't done this as I think it can cause other security issues. Right now it is set at true.
I NEVER have trouble logging in. I use firefox or safari so maybe its a browser thing?

In a possibly related (or possibly not related) issue people on the same browsers (IE and Mozilla) have problems checking out. They get re-routed to the home page over and over again and all the address and item info they entered is lost. Maybe this is two separate problems? Help me with the first one and at least I'll be halfway there! Thanks!!