Ever got the blackness when you try to build, heres a few tips to fix it.

1. Place a block on the black region
   
2. Log out
   
3. Then back in.
   
4. Then get building.
   

This problem is mostly on skyblock or maps with have a generator that makes a void map, this has happened to me and its pretty annoying, Hope this has helped you guys, leave a diamond or whatever if this guide helped. ;]