I just wanted to add my name to the mix. I am also having this issue. I am on a Mac, no mods or CC, and just Strangerville and Vampires content added. Do we not have an answer yet as to why this is happening?
Same here. I built a sweet underground Turkish bath overlooked by a balcony one level up. Now all you can see from the balcony is a dirt floor ☹️
It's 100% the patch. I'm pretty sure it has something to do with the beaches being implemented, as you can't build basements on some beach lots. I was building a cool multi-level tomb before the patch no problem, updated, then this happened. Apparently it's not only acceptable to release unfinished broken games, but now unfinished broken patches as well. Vampires are also more broken now, as well as toddlers.
I have this as well, after reading a few replies I figured I would give something a whirl.
Empty CC folder
Empty Save folder
Empty Cache folder
Delete Thumbnailcache
Patch game, ensure CC Option is off. (So nothing should be loaded by default)
Create new game, create random sim (I got the blonde lass from the base game). Randomized traits.
Bought "crick cabana", activate cheats, added 1000000 Simoleons., deactivate cheats.
Created basement, removed roof on first level opening it to the sky (Check, working as intended), added sub basement using basement tool, remove Floor (failed as dirt floor appeared).
Deleted basement, repeat with Wall tool (same result), Varied the depth of the basement (Same result).
Tried to use the remove ceiling as well as the remove floor commands with the same results.
On the plus side the translucent dance-floors still allow you to see through any level of a house into the level below. 🙂 Basement, change related maybe?
So I am thinking that this is definitely something with the patch.
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Looking at this a bit more (This is what happens when I am reviewing design documents for hours at home) it also seems that there are some other changes in build mode behavior underground. The hammer tool seems to work differently. I don't remember having to highlight a whole subterranean room and hit delete to remove it. I am sure I used the hammer to knock out parts of it, now I get a small Orange popup that I have never seen before saying "Action not possible here".
Created walls underground that don't form a "room" can be removed by the hammer tool as I remember but once it's a room it seems that the hammer isn't as useful.
Also, there seems to be some relationship between ceiling and floors in a two level basement. Unless I had a ceiling on the lower level AND a floor on the upper level you only see the dirt. (of course if you have neither it's all dirt). I don't remember that limitation previously I thought you could at it from either top or bottom and it just showed up.
We need a fix for this bug ASAP. It has made a load of my builds unusable. What are we paying our money for ?? It would seem a sparkling new user interface. The old one was fine.. May I remind UK users that you can demand your money back if software is not fit for purpose under our current software laws.
Kind regards James.
