My upstairs bathroom is leaking downstairs. I thought I fixed it when I sealed all the grout and tub fixtures. It doesn't leak every time but when it does it really does. I have noticed that after I take a shower in that same bathroom the tile next to the tub has water underneath it. There is no overflow from the open curtain or any dripping. It has to be leaking from somewhere in the tub. Could the underneath of the tub leak ? The toilet is loose but I checked and don't believe this is the problem.
Thanks
Lovelypam

Can you explain the 'water under the tile next to the tub' part? I'm not picturing how you can see water under tile.
Also tell us where the access is to the shower plumbing - what's on the other side of the wall.
One thing I would do before you start cutting out a patch of ceiling or wall to check plumbing is to keep very careful note of what exactly you did the times it leaked vs the times it didn't.
And it could be your toilet wax ring...