Solved FTB Hangs during start

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Jul 29, 2019
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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?

 
Jul 29, 2019
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Answer found. Search for 20-30 minutes and found nothing. Posted this and the next thread I read said it was an Optifine issue. Tried it and it worked. Sorry for wasting anyone's time in debugging this. But hopefully this gives another chance for someone with the issue to find the answer. Delete Optifine from the mods folder.

(Moderators: Delete if you think best.)