Logging on to WoW this afternoon (a US server, at least - the EU realms may not share this issue), I received the following in-game message:
We are aware players are experiencing an issue with the display of recent enchantments to items. We are working to resolve the issue and recommend players refrain from placing enchantments on items.
Now, I can't yet find anything about this on the forums or the website, but with such an vague yet ominous message (and as expensive as enchants can be), how can one help but listen?
Update: Still not much detail on what the intial problem was, but this was hotfixed later in the evening.