Hello, 
So, today I wanted to replace entire map to add snow textures, but when I did so, the buildings become invisible. 
The amount of textures I replaced: 1114. 
I tried replacing 400 and the problem did not occur, so I take it that there is some sort of limit? 
Video explaining the problem: 
 
Is there anything that can be done? or is just impossible to replace this amount of textures?