Latest 1.15.1 beta 2 version
Load mod and cant click or play mc due to the endless loading screen, and just when it shows the menu buttons it loops again. Very strange encounter.

Which forge version are you using?

I've had this happen on the latest 30.0.35 as well. Was going through all the different mods that I have to see what was causing it. 1.15.1 - 1.0 - beta 2.

30.0.30

Should be fixed in 1.15.1-1.0-beta-3 :)