Front deraillieur

firstly..ARRRGGGHHH

changed cables a few months back on my bike an basically had problems ever since

i can tune the front mech to shift sweetly, the following day i cant get on the top ring, the cable isnt slipping or owt

i now believe my bike is possessed

something weird

with the H screw totally loosened off the chain is rubbing on the cage an the cable is like a banjo string. my front derailleur is a braze on so its not like its shifted a touch on the down tube

im stumped grr