@snoltan - AU's and VST's run in the same process as EigenD which means that if they crash then it always crashes EigenD and appears as such (and depending on the problem it might even cause EigenD to crash at some random later time too as an errant AU can break all sorts of things). We, as an AU or VST host, don't get any say in this matter, any bad behaviour by one can bring down EigenD and there is little we can do about it. Technically the onus is on the AU author to write their program to behave well and there is no protection for the host program (EigenD in this case) if they do not.
There are a lot of less well written AU's out there (which is to be expected really, especially in the non-commercial free ones) and there is sadly a limit as to what we can do about that. We haven't actually seen a situation for some time in which we've made a hosting error. This is not to say that that isn't possible, it's just that the interface isn't really that complicated and we got most of the bugs out several years ago. In the last year every problem we've had reported has turned out to be an issue with the AU or VST rather than EigenD.
EigenD does represent a mildly different runtime environment for AU/VST's than many DAW's. Not in any sense that it obeys different standards but it does use threads in a different way to say Logic, which can tickle bugs in peoples AU's. We have seen just this in a number of different situations in the last couple of years. As far as you're concerned this is of course irrelevant, it's just broken and that's annoying, but it does mean that there are limits as to what we can do to fix it. And it's worth bearing in mind that quite justifiably many AU/VST authors don't test their products against EigenD, they just pick one or maybe two major DAW's and use those.
I'd love to be able to host AU's in a nicely sandboxed, robust way that meant EigenD didn't crash when they do. Unfortunately the performance hit you'd have to take to enable that is huge, and until computers get a whole load faster, it's just not practical.
John