When we started seeing this gray discoloration in our master bathroom, we knew something was up and that it was probably time to do a little remodeling. We were pretty sure it's not a good thing when your flooring changes colors. :)

Here's the culprit - a tiled bench in the shower. Obviously this picture is after we removed the tile and some of the backer board. Lovely. As we tore it apart we could tell exactly why we were having issues...the previous owners must've hired a 3 year old to install it.

The shower stall after the removal of the tile, bench frame and shower pan (which I, Kelli, removed all by myself...just had to give myself a pat on the back).

Next I tore up the linoleum and found a really pretty, black, moldy mess.

While I was tearing out the flooring, I notice in a crevice by the wall that it looked like there was another layer of linoleum under this top layer of plywood. Sure enough, I was right...

Yeah, so that's the mess that we have going on at our house. We're hoping that the lower level of linoleum acted as a barrier and that we'll just be able to pull the top layer of plywood and the lower level of linoleum off and we'll be good to go. Keeping our fingers crossed!
Not sure why someone would think it was easier to lay plywood over the existing flooring, rather than simply pull the old linoleum up and relay linoleum? I guess if you like playing with power tools...