Leak in floor under shower could it be the track the doors slide on as I hsve cauked the tiles

I guess here, the first thing I would do is to take a 5 gallon bucket of water and I would pour it down the drain 3 or 4 times (15-20 gallons) and I would see if the drip showed up downstairs. Be sure to give the leak time to show up, OK? If so, the leak is isolated to the drain or the shower pan.

If that didn't result in showing the leak then I would remove the trim plate from around the shower valve and then run the water to see if anything is leaking behind the wall.

If either one of these tests do not make the leak show up then I can think of a couple more tests, but try these first... see what happens and let us know, OK?

Finally, what condition is the tile wall and tile/grout in? If there is any cracked or missing grout I would suspect this may be the issue in itself!

Back to you...

Mark