To be clear - latency on transactions was at around 600 seconds in the middle of the day - that is, an order to "buy" at the market, or "sell" at the market, took 600+ seconds to execute.
For about 20 minutes, they buy/sell buttons were non-responsive. You could click on them - but nothing happened. I have a suspicion (without evidence other than observation) that at one point today the buy/sell functions were disabled.
I experienced two failure scenarios today - they were very different.
Failure Scenario #1 - Buy/Sell Buttons were not working. You would click them - but absolutely nothing was happening. On #MtGoxLive there were a number of us all experiencing exactly the same thing. A few believed it might have been a javascript issue.
Failure Scenario #2 - Once the buttons were activated/fixed - your order was placed in queue instantly, but remained "pending" - on #mtgoxlive, ;;goxlag showed lag time of about 600 seconds - My order went from pending to "executed" exactly according to ;;goxlag.
For about 20 minutes, they buy/sell buttons were non-responsive. You could click on them - but nothing happened. I have a suspicion (without evidence other than observation) that at one point today the buy/sell functions were disabled.