I have been playing FTB Presents Direwolf20 1.16 1.1.2 and everything was working fine. But when I upgraded to 1.2.0 it crashed. I reverted and it still worked. So I waited until 1.3.0 arrived and tried again. This time it hung on the screen where the white square grows to fill the square at 100%. It gets to 100% and then hangs. I have left it for an hour with no progress. I gave up and reverted. But I want to try some of the new improvements I see in Direwolf's Lets Play. So I tried again with the latest 1.5.1. And again it hangs at 100%. Any ideas as to what is happening?