I just placed an order yesterday, didn't have validation issues.
Most annoying online purchase ever though...
First I go to Amazon and try to buy it. Amazon ends up selling it though a third party, and apparantly Amazon doesn't talk to this third party, because Amazon was telling me that they have it in stock, then when I bought it, they told me that it would ship out Monday. Then I get an email fron Antonline, the third party, saying that it's out of stock and they're refunding me. They don't say whether they cancelled my order or put it on backorder though. I went to Amazon and they said 'Ask Antonline about your order status' but because I went solely through Amazon, I didn't have an account at Antonline, so I couldn't check the status or cancel it. I send them an e-mail on Saturday, still no reply.
Then on Monday I order it from Newegg. I go through the whole process, then when it does that 'Processing' screen, it told me that there was a server problem and to try ordering again later. I checked the 'My Recent Orders' thing and it didn't show up, so I tried it again five minutes later. Same thing. Then I check a half hour later, and it's put through two orders, so I had to cancel one.