I need some advice/input. I recently purchased this home and noticed the baseboard was a bit soft. I have since removed the baseboard and occasionally water is seen filling up the area. Not a lot, but enough to swell the door jamb. In an attempt to find the link I capped off the shower head and turned the water on for 24 hours. There was no leak observed. My friend thinks it could be the rubber around the drain line. I have attached two pictures. Please give me some suggestions.
If it was leaking out of the rubber ring it would not go to your baseboard, it would show up below floor. Sounds like to me it is leaking where the wall meets the shower base, Clean all the old cauling around shower base and recaulk it and see if that helps, let me know.