I fixed my leaking Moen tub spout a while back and all has been well until today. Nothing else has changed with the spout but now it is leaking worse than before. Before was a drip, now I have a solid steam leak. All the parts are changed and brand new.. any suggestions?? Thanks, Christine:cool:

You didn't say so I'm assuming that this is a slip on spout. Here's one a lot of installers miss when they go to mount a slip on diverter spout.
When the end's cut off the copper pipe that sticks out from the tile the tubing cutter leaves a burr/ridge. This ridge catches on the "O" ring and forces it out of its place so that when the spout diverts to the shower it leaks out the back.
To get around this problem take sand cloth and sand the burr down to a bevel. Then before you install the spout moisten the end of the copper so it slips on easier. Good luck, Tom

Is the spout leaking or is the faucet leaking through the spout?

I had to replace the stem piece again. One of the "O" rings was split! All fixed. Thanks everyone for your help. Christine