For your information, it's been two days it is impossible for me to order anything. I reach also a "Magento" error page. I use Firefox.
In the past I used to order using Firefox without any issue. You must have changed something.
So Firefox is not the solution either... :-(
I will try with Google Chrome, and let you know here.
BTW, I tried to inform support via email, and I got "Error 503 page". Quite annoying to have an issue and being impossible to contact support also.