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Naildriver
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Welcome to the forums. Close up pictures don't tell us much. Now that we have them, can you step back and give us a more composite picture of the shower? I can't tell wall from floor.
 

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Naildriver
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14,840 Posts
Any time you have opposing planes in tile, the corner is not grouted. You use an elastomeric or grout caulk to fill in the joint. The two planes will expand and contract at different rates, hence the cracking. The grout should be removed using a grout removal tool, and grout caulk (in a matching color to your wall grout) applied.

If it is a new installation, don't void any warranty you may have with the installer. Keep trying to contact him and if all else fails, document the calls and mitigate the damage by doing it yourself.
 
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It's possible the wall and floor are separating, but not likely. It could simply be cracking grout due to shrinking (bad grout or too much water, etc), or normal expansion/contraction of the building materials (not actual shifting). This is not necessarily a problem other than aesthetics, if the shower was waterproofed correctly to begin with (i.e. behind the tile). If it wasn't, you are in for some reason water damage to your framing.

Have any pictures of the shower being built? If you get ahold of the contractor ask them how it was done. If they just don't respond, file in small claims court.
 

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if you have pics of the shower being built, post them. if you don't, now you know that whenever you have pretty much any work done, take pics, lots of them, as the work progresses.

if that guy did that, no telling what else he did, unless you have pics.
 
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