Well, add me to the club. I have a brown ale with "ring around the neck". It looks like small dark specks clinging to the neck of the bottle. I am forcing myself to drink it as penance and I keep going over in my head what part of the process is not sanitary. It's odd, only some bottles taste bitter to the point of being called astringent. Other bottles with the ring taste fine.
Things that I have narrowed down as being the culprit:
siphon hose - threw it out and bought 20' for about $3
I forgot to sanitize the bottle caps until I had all the bottles filled. I dunked them in bleach water for a couple of minutes and rinsed (probably not very well).
Oh, and then there was the cat hair I found in the secondary fermenter when I racked to the bottling bucket.
Anyway, thanks for starting this thread. It makes me feel better that people that have been brewing for awhile still get the occasional funky batch. It also feels better to admit my problem. Hello, I'm Engelramm and I have an infection.