Save file issues

I play on PC, no mods installed. I have most packs but barely any kits. I get these issues with every new safe file. I repaired the game endless times, deleted caches, completely deleted everything and reinstalled everything. Nothing worked. 

There is a huge bug with the for rent pack. Installing some rental units from the gallery leads to not being able to edit lots in the same world (that are original, untouched lots). I get an endless loading screen. Only removing the rental unit in the world helps to resolve the problem. There are also a few lots with no rental units in the world, that aren't loading and I get an endless loading screen. I haven't found anything that works for it so far. Right now they are in the Lovestruck world. 

There is also a huge issue generally with gallery builds, leading to all lots in all worlds to not being editable anymore. It's a lot of builds in the gallery, that can lead to this problem. I haven't found anything in common with them so far (packs etc.). If I place a wrong lot, no lot in the whole save file can be edited anymore. I can delete or change or place exactly one item, then have to switch tools to do exactly one action with them and then I can switch back to the former tool and have a single action again. It makes it impossible to play the game. Already send you a game file over a year ago with this issue. It's been here for at least over a year.