I've had the same problem since installing AR10 (see my reply post from na6t on 4-5-2011). Nothing but problems. I've got a 15 form porfolio about 560k in size and nothing but problems opening it in two different offices using win xp Pro SP3 3ghz/3gb. It stalls and about half the time it crashes AR10. This never happened when we were using AR9..
welcome to the club,,