Hey there @imnomad! From the outset, it sounds like there could have been a migration error. The 3 mentioned errors prior are common as you deduced likely unrelated. The primary error reporting as a stack overflow itself doesn’t give us much to work from since it’s not meant to be easy to do within the UE framework and the stack itself leaves other questions since it ultimately hails from the BP support utilities.
Let’s start from ascertaining where the issue stems from.
If you create a basic starter/empty map, and set that as your entry map, does the crash still occur before the map loads?