When I click "Add to Cart" on my ecommerce site(s), and then go to the shopping cart, either:
A) The shopping cart is empty
B) A random, incomplete selection of products I've added to the cart is shown.
If I refresh, it might be empty, there might be a few random products in there. Who can say.
I have multiple sites running on the same WordPress network ( http://www.luxurychristmaspillows.com/ and http://leylas.luxurychristmaspillows.com/ being two of them), and this is affecting all of them, so it's something with the plug-in, and not the theme.
This is a new problem, just noticed it today. I THINK it might be based on the latest WordPress update (3.0.1), which I upgraded to a day or so ago. I can't rollback my update (too many sites to backup, no FTP access), and generally you don't want to do that anyway.
Anyway, any help would be greatly appreciated!