As you can see in certain areas everything disapears, in other areas, only a few things appear. I dont understand what I changed that may have caused this, please if you know a fix please tell me!

I have done hundreds of test but i just moved on with a different map file, it may have been caused by not caulking the brushes properly, idk. Either way i have not seen this error again yet

I think i have the same issue. So your brushes,models were randomly disappearing in-game?You created new map. file and that's all?  Will try that. But this issue is appearing third time on my map. So it will definitely appear again. Would like to know the reason of this.

I think i have the same issue. So your brushes,models were randomly disappearing in-game?You created new map. file and that's all?  Will try that. But this issue is appearing third time on my map. So it will definitely appear again. Would like to know the reason of this.

i posted on your post a possible fix because making a new map in general did not work, aka copying what i made to that new map