On July 20, FogCreek released FogBugz 7. Joel Spolsky bragged about being a week or two ahead of schedule thanks to using EBS 2.0. However, the release had some pretty annoying bugs. Those bugs were fixed in the next release, on July 28.
With all due respect to EBS, I think that instead of releasing ahead of time, FogCreek should have started eating their own dog food. They would have discovered most bugs themselves, fixed them and released approximately on schedule, but without the bugs.
The way I see it, the real release was on July 28, and the date of the buggy release is irrelevant.