What is the most likely culprit(s)? - Leaky Tower

Ugh. Just spent the better part of the afternoon switching my 5 ft. beer lines to 10 ft. lines in my kegerator. Everything seemed to go smoothly. Was able to tighten everything, used plumber's tape, lube, etc. As soon as I hooked the beer lines to my 2 carbonated kegs, beer started dribbling down from the draft tower into the kegerator, and out of one of the faucets into the beer tray. I re-checked everything (as well as I could, since peering into my tower is a PITA) and I don't get it. I unhooked the beer lines and shoved some paper towels into the bottom of the tower to collect any more drippings, but am stumped. When I took everything apart, maybe I messed up putting something back together?

Thanks for any and all help. These 10 footers better be worth it!

Well there are three connections you have to worry about/check:

shank -> faucet
barb adapter -> shank
hose -> barb

Most tower shanks have a barb already on them, so it might only be two places.