One of our image processing servers lost the plot earlier today (February 02 2012). It was saying a font was installed when it wasn’t. As a result a lot of orders and previews got Arial or some other random font inserted in place of the proper font. It didn’t happen to all the orders, but enough of them to cause trouble.
The problem appears to be fixed now, but we can’t say for sure because it relies on a visual check, so please, let us know if any new orders are still faulty.
Regenerating the files should help. Send us a link to the order if it doesn’t.
Still trying to find out why this happened and if any other servers are affected.