Good to hear your problem is fixed. Fixed mine today. It was the dip tube. The top rolled lip had a small bend in it. Co2 would blow by when the tap was opened and mix with the brew. Sooooo glad its fixed.
Did he say to leave the system open with an air lock? Maybe you just need to purge a few times a day. I think I will give it a go. I tried a longer line with no good results. I let you know my results. Until then it's PBR
WOW!!! I got the same problem going. It's driving me crazy. Last Fix: opened the keg to purge all gas, re-assembled set reg. to 5psi......wicked foam. WTF? I hope the longer lines cure the crazy-hares problem.