The problem is that in the last several days, I have crashed upon hitting the "Play in world" button at least 10 times!!! The crash is always signalled by a slight pause (perhaps a second) followed by a crash to desktop.
Usually but not always this is after already having pushed the button quite a few times so that I can look at the anim from different angles. Also frequently I will already have one looping animation playing (a "ready" animation"

I've tried all the standard stuff, rebooting, clearing cache, etc.
So.... Is it just me? Are other people experiencing crashes when playing animations?
It would be great if I had a very consistent set of repro steps, but I haven't been able to make it reproducible enough to avoid the cursory "report it with a set of repro steps" standard LL response.
It would be great if more than one person with this problem could put their heads together to repro it like that thread about the texture bug did

Failing that, is there another process that the good animators use to test things in a rapid revision cycle? A process that doesn't crash all the time?