The Disney websites have stopped working for me in Chrome unless I browse in incognito mode. They don't even work well in Firefox or IE for me lately. So Chrome incognito it is.
I will put it this way... until I booked my 2013 trip, Disney's site still showed a countdown for my last trip (2011). That I think is just an issue with Disney like how it sometimes won't show your dining and resort reservations.
I do have problems off and on. I use google chrome. I usually have to log in twice before it will go through and I usually have to add my reservations number to get my reservations to come up even though I'm already logged in.