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So once I get everything dry and tidy, given some of the larger gaps, should I be filling them with sanded GROUT or sanded caulk, or what material? Thanks, Leor

There is no visible water at this point. So I should apply GROUT between the wall/floor, not caulk? When you say corner joint, you mean literally, just the 4 corners?

Thanks for the response. See below: -- Did you dig out all the old caulk or grout? Yes -- Did you clean the line with denatured alcohol to remove all traces of old silicone above and below the caulk line, then wipe it as clean as possible? - used rubbing alcohol, Yes -- Did you use mold killer...

We have a tile shower stall that was built several years ago. The pan is composed of a membrane liner and concrete pad, with tile over that. The caulking around the perimeter of the floor would get moldy every 6 months or so, and I have to replace it. I think there is moisture behind the caulk...