Whoops! Your session has expired.

[YellowStarS2k]

Another observation. If I log in, then try to check out, it logs me out with the same message. It seems like a cookie issue, but I'm not sure how an addon or restoring a backup would cause cookie issues.

[YellowStarS2k]

Okay, did some more research but still no luck. It seems definitely to be an SSL issue because if SSL is disabled, I can checkout.

I messed with some of the settings in Session, but made no difference. I tried both True and False for the following: Force cookie use, Check IP address, and Recreate session.

https://www.zen-cart.com/forum/showthread.php?t=91842
Here's another thread about it, but I'm not sure if there are any real solutions in there.

[saitomedia]

I had exactly the same issue before, but it was caused by my web hosting company applying suhosin (php security) over my account.

Here's the thread: http://www.zen-cart.com/forum/showthread.php?t=113844

Try installing a fresh zencart on another directory and with SSL, see if it does the same thing.

[YellowStarS2k]

Thanks! I tried searching, but I guess I didn't think of searching for shopping cart is empty.
I will contact my hosting company.

[saitomedia]

Please let us know if suhosin was the issue with your host, and if this solved your problem. TIA

[YellowStarS2k]

Hmm that's odd. I've been talking to support, but all of a sudden it started working again...

[YellowStarS2k]

Goddammit, now it's not working again...

edit: never mind, this time the session really did time out. haha