I think so. There is no output in the log at all.
The workaround for JBIDE-11215 (setting 'unauthenticatedIdentity') is still in use here, so *that* issue may still be present in Alpha1.
I just checked with the developers, and they also see the problem with Alpha1 :( But not as prone to happen as with Alpha2.
Restarting the server twice fixes the problem...