Finding it hard to build a house.
I have come back to the sims after quite a while, more than a year. And started a new game with a new person in a new lot. But I am having real trouble with building a house for her. It started when...
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There is a bug report for the error message when trying to place a door. The SimGurus cannot replicate and are asking for saves to try, eventually, hopefully, to fix it:
https://answers.ea.com/t5/Bug-Reports/NEEDS-SAVES-Doors-Windows-sometimes-won-t-place/m-p/9716605/highlight/true#M160369
Edit: For your unplacable/disappearing objects I am clueless. I can't replicate it, but then I don't know the prerequisites. Here is a bug report on some objects not being able to be placed on a plattform, but you did not mention a plattform:
https://answers.ea.com/t5/Bug-Reports/OPEN-Can-t-place-certain-objects-on-platforms/td-p/9723044/page/2
You could upload your build/post a picture/describe more to make it clearer. I hope you have done the usual fixes first though, like updating your game, removing any old mods and cc, clearing any cache, repairing, the game etc.
