This morning I filled up the shopping cart…twice…each time I got a 500 error.
And artwork isn’t loading…something broke overnight! 
Here’s an odd question: Are you using Firefox and did you recently update to the latest-greatest Firefox?
I found that Firefox 57 on Windows gets errors when accessing app.glowforge.com, but Chrome on the same computer has no problem.
(Firefox 57 has lots of other problems, too. As browser releases go, it’s a lemon.)
I use Chrome.
I rebooted and didn’t fix this…although I can add artwork now.
I think it’s on the fritz, lots of people having that issue today including me.
Same error 
And I have multiple order confirmations.
Thank you for letting us know about this. I see you already emailed us about this and we’re working on it there, so I’m going to close this topic.
If anyone else is having trouble checking out of the shop, please reach out to support@glowforge.com.