After pouring myself an IPA from the keg, I found its flavor had changed considerably from last week. It was more bitter, almost harsh, and the wonderful grapefruit/citrus aroma from the late addition hops was almost non-existent.
I kegged this beer about two weeks ago... last week it was fine, but a little under-carbonated. I turned the regulator to about 10 psi to up the carbonation a little under a week ago. Could this be the cause?