The grout is cracking in the tiled shower.

This can be due to house settling or grout that was never sealed, allowing water to get in and break it down. Scrape out the old grout and replace it with Bostik Tru-Color premixed grout (about $76 for a 9-pound bucket; sears.com), which contains urethane to make it more flexible and eliminate the need for sealing.
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