[jimcol]

It may not be the shower enclosure that is leaking. Sometimes the fittings at the faucett leak inside the wall and run down to the floor making one think it is the enclosure that is leaking. An easy way to check is when the dripping stops through the floor of the shower take a five gallon bucket and fill it several times from the shower hose. Be sure none of the water splashes out of the bucket into the shower enclosure. Remove the bucket and dump it outside. If the drip reappears in the basement the problem is probably inside the wall. Let us know what you find.
Jim