Stuck on 'Building Terrain' screen

When I create a world or join one in Minecraft version 1.9 and above, to the latest update I get stuck in this screen in link below:
https://puu.sh/rJBXP/8de219a303.png

The log shows this:
https://puu.sh/rJC0m/4407670b01.png

I'm unsure of what is the cause of this issue and have tested it on 2 PCs which have given the same issue, and am requesting help from here. Also, I have reinstalled Minecraft, reinstalled Java as well to no avail. Hope to receive a reply! Thanks.