Re: [FIXED] Strange black streaks on map (Newcrest)

@CGrant56  Thank you for taking the time to look at my problem and thank you for your reply! 

1.  It happens with any house I place from the library. Yes, on the first picture it happened with the same house with the turret, but if you look at the build in the upper left corner of the same picture, you can see it happens with a different build as well. Just on the right side of that upper left lot you can see a very vague black spot + stripe and it has a different shape than the other black streaking from the other build. The strange thing is that right next to it, I placed the same build and it didn't cause a black spot + stripe. This build and the house with the turret are both houses I  built from scratch. Previously, the house with the turret didn't cause any problems.

The three pictures are all from three different saves, because I wanted to test the problem. The first two are new saves and the third one's a save I had since may/june. I did 'replace' (i used other builds in a different save, not really replace the same builds in the same save) the houses in a different save but only some of the black streaking happened, so yes, partly correct (to answer your question if the black lines have gone away). For example on the third picture in the lower right corner, I placed a very different house (the brown house) from my library. This is a house I downloaded from the gallery from another user and renovated to my liking. I uploaded my renovated version to the library and placed it on the lot in the lower right corner. This house caused very different black streaking with a different shape than the build in the first picture. So with that house the black lines didn't go away. Sorry for the confusion, they're different saves.

2. Short version: it happens with both my own creations and downloads from the gallery. No CC. Longer version: The builds on the pictures that caused the black lines were my own creations.  But on the third picture a downloaded lot that I renovated caused the lines (see previous answer). I didn't use any CC with these builds. The downloaded build  didn't have CC, because I only download builds with objects from the game itself. Just an explanation of what happened in the third picture as an example: in the third picture on the lot in in the lower right corner (the brown house) I placed a blue downloaded build (basegame) from the gallery with no CC. There were no black lines, everything was fine.

I made copies of this save and tried 3 things. First I tried to replace that blue downloaded build with a MAXIS build from the gallery (the red house from parenthood), and it caused black lines. Using a copy of the save, I placed my own creation and it had black lines. In another copy I placed a downloaded build that I renovated (the brown house) and it had black lines as well. They all had the same black lines with the same shape so maybe it was caused by the first downloaded blue house? The weird thing is that in other saves that blue house doesn't cause problems. The downloaded blue build is a basegame house and as far as I know (there's a building video) the builder didn't use CC cause none of their builds have had CC and this was a house that could be used by "everyone" because you only need base game and no extra stuff.  

I must say that at one time I had build CC in my mod folder, but I didn't use them with any of these builds and saves. At the moment I don't have CC/mods, but I both tested this bug when I had CAS CC and a script mod in my mod folder and when I had no CC/mods at all.   
Could it be that I should clear certain folders in my Sims 4 folder because it could corrupt the game with leftover cc/mod/ traces? I already always delete the localthumbcache.package and have deleted files in the cache folder, but maybe theres more? I've also repaired the game. 
Wow that would really suck if 'sometimes, it just happens'. I get so frustrated because of this bug because I'm always scared to place lots in my saves, in case one of the lot causes black lines and ruins the whole save for me ☹️ Especially when working on a base save file, all that work for nothing...Especially because it happens randomly and not always. A build doesn't always cause black lines, just 50% of the time and it doesn't matter which build or lot it is. 

3. The house never had CC in it. And I never downloaded outside trim CC ( I had to look it up lol, does it even exist?)

And to answer your last question: Yes I've tried to bulldoze the lot in build mode, but the black lines stay. Also bulldozing and after that placing a different build from the library or building from scratch on the bulldozed lot doesn't make the lines go away. See my attached picture.
Sorry if I was a bit unclear in my start post, the pictures are all from different saves. When the black lines appear in a save, they never go away and the save will always be ruined in that way...

If I was unclear about something or used too many words (I like to be thorough) and it became unclear, please say so!