Keep in mind that when using a nightly you are no longer a user, you are a tester. Calmly report bugs to the bug tracker. Discussion of nightly builds should go on the to-be-announced mailing list for testers. Testers should be following the changelog and commit timeline to know what they are getting into with each download. The nightly build download page will be updated with this information.
We appreciate those who test our nightly builds. You are a critical part of the success of WordPress and all open source software. However, the support forums are geared toward support of stable releases. So, let’s move the beta test conversation to a mailing list. Watch for an announcement.