Hey Crinrict, (again) lol. This time I'm posting on my behalf.
Let me start with your basic questions first:
1. I have CC and Mods (MC, ErrorTrap, Overwatch, Decensor)
2. I have IP and the patch
3. Patch 1.55 (I think that's the new one)
4. I used an unused existing game, (if that makes sense)
5. I transferred sim from Bridgeport to Isla Paradiso
6. Isla Paradiso
7. Win 7
8. Downloaded Version
9. Home-World
Okay now for the issues:
1. I think this error might be caused from Twallan's MC, but when owning a resort, I cannot make custom uniforms (I can click the option, but nothing happens)
2. Sims can't eat Kelp, only gift to other sims.
3. Visitors never leave, even when asking them to. I reset them and deleted them from my house boat, and then they still reappear
4. (Might not be a glitch, maybe just bad luck) But no sign of Mermaids in any Dive-lot
5. Just reloaded my current family and not only are they not being shown, but my houseboat is gone. I have no clue what just happened.
Possible Glitch
I also noticed when I moved my sim from Bridgeport to IP, I moved her to a houseboat port, and before I created the houseboat I moved her onto the port itself and the house boat disappeared and she reset into the ocean near an uncharted island. I don't know why that happened, but I just purchased a new port and then created the houseboat while she was on it and everything was fine after. It was pretty weird, lol but I learned my lesson.
I think that might be it though. I know Twallan said MC needs another update now that the EP is out, so the first issue might be fixed after that. And issues 2 and 4 might be connected.
Also, does anyone know how to waterskii? I have no clue where you find that option.