Mark H. has reported some thread race when AsyncFilter[1] are used. If
you are using AsyncFilter, can you test your application and report if
you are seeing regression like described here:
I cannot reproduce Mark's issue and Comet, which build on top of
AsyncFilter, doesn't seems to suffer the issue. But I'm pretty sure
there is a regression so that's why I'm holding the official 1.8.6 release.