This article seems rather biased and brings in lots of past problems at Mt. Gox rather than focusing on the current issue - perhaps because a more detailed explanation of the current issue would reveal that this problem goes beyond Mt. Gox. There is a disturbing tendency among some Bitcoin partisans to instantly dismiss any issue that comes up as being well-known and well-understood, even if "well-known" means that it was posted somewhere on a message board read by few.
If it goes beyond Gox, why are other exchanges operating seemingly with no problems? Bitstamp is a good example of a well run exchange. Gox has been mired in self inflicted problems for many months.
From my understanding, workarounds do exist for the issue, and some exchanges probably have implemented them. However, the issue goes beyond Gox in the sense that without those workarounds in place, any exchange could be vulnerable.
