Mysterious Bathroom Leak

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I came home to find the master bathroom floor and half of the master bedroom carpet totally soaked. The closet, which is adjacent to the tub/shower, was also soaked. I thought a burst pipe but the plumber couldn't find any leaks. He checked the toilet, sink, went under the house (no leaks, no wet spots on sub floor), and went in attic to check the roof and look between the shower walls. He also noticed that when he turned back on the water main, the meter didn't move, showing there wasn't a leak. There's no black water or smell. the only weird thing is a white chalky substance in the sink and on the tile floor of the bath. Any clues? I appreciate any help!!