The Flash crash I've hit most consistently over the last week or so is when switching between normal and fullscreen and back again on a live stream or video on the BBC site. I've only seen it in x86 Mozilla -based browsers, others get problems with x64 builds/forks too - but I haven't had any time to exhaustively test all the Mozilla -based browsers I have installed. (I have no Add-ons and only Flash as a plugin and I have tested from a new FX profile and a clean Windows profile with similar results.)
BTW, this Flash update is for non-IE browsers, Flash in IE should remain at the old version level.