Nightmare #1: The water...

We had a through home inspection before we bought the house, and other than the issues with the electrical and the cosmetic issues that we addressed right after we moved in, we thought that the house was in pretty good shape- supposedly new plumbing, new HVAC, new electric, etc. etc. We were happy! Then, we started having more and more problems with the water pressure in the upstairs bathroom. It seemed fine during the home inspection, but after we moved in, we noticed that it was pretty wimpy, the water was a little rusty at first, and it took FOREVER to get hot. We had new pipes, so we couldn't figure this out. We started calling plumbers and all said the same thing- you need your main water line into the house (it was still galvanized, and had not been replaced yet with copper) replaced. This is not cheap. The people on the other half of the house understandably wanted to wait until their baby was a little older before we did the work because of the chance that it might affect their water service. So, we showered in the tiny basement shower all fall, winter, and spring. We finally got agreement from the people on the other half of the house to do the work this summer. The plumber had to use a torpedo thing to drill a hole from our basement out to the street and then thread the pipe through it. Then they dug up our sidewalk and our front flower bed and connected the new pipe to the water main. It was pretty spectacular equipment, and the work only took one day. When they left, and I went upstairs and turned on the shower I was very impressed with the pressure, but the water was still freezing (we had been under the impression that the water moved so slowly through the pipes that it cooled off before it reached the upstairs shower.) I flipped out and called the Mr. to come home from work- we start throwing around ideas- rip out the walls and insulate the pipes, add a 2nd pressurizer tank for the 2nd floor, etc. etc. When the Mr. got home and started playing with the faucet, trying to figure out if it was an issue with the mixing valve, he suddenly figured it out---
Mr. DDP had crossed the pipes when he connected the shower faucet. And no one ever figured this out until now- not the realtor, not the inspector, not the 4 plumbers that had checked the place out, and obviously not us or any of the visitors to our house that had taken a shower. No one. Oh well, at least it works now.