The store appears open at the moment, were you using your cart when it was emptied, or did you possibly create it on a different computer/browser? If it was emptied while you were using it, you may want to contact the store to ask if they deleted their inventory.
If he's retounely clearing his inventory to upload again, perhaps the seller should be notified that's rather annoying for customers with open carts...
No idea if this is what happened, but it would match what Olle described.
Comments
Seems to be around without being closed (or shut down):
http://kieselbrick.brickowl.com/
How old was your cart? Carts do get purged after a few weeks....
Cheers, Eric
No idea if this is what happened, but it would match what Olle described.