Generally speaking if you encounter a bug on the site wait a bit, try again, if its still wrong bring it up in the CB first, or via /msg to one of the principle pmdevils. Usually it will be a momentary thing and will be fixed before you can report your bug, but if not definately ask in the CB about it. There is almost always a god around to respond, or a pmdevil who can explain or patch.

If all else fails report it in PMD, but usually that isn't necessary.

thanks