Hello,
Building the BuildingEscapeClone on 4.22.2 and is stuck at 45%.
https://answers.unrealengine.com/questions/455641/stuck-in-45-in-unreal-engine-4125.html
The first time you try to open a new version of the editor it will re-compile all of the shaders and stall at 45% for some time. Depending how large your project is (and how fast your CPU is), it can take anywhere from 2 to 30 minutes to complete.
If anyone experience something similar.