I try to change the Mojang priority, but it’s greyed out. This is a bug!
What I expected to happen was...:
To be able to change the Mojang priority.
What actually happened was...:
Instead, it’s greyed out.
Steps to Reproduce:
Open the bug tracker
Create a bug
Try to change the Mojang priority
Notice it’s greyed out
Workaround
Click Configure Fields
Uncheck Mojang priority
Recheck Mojang priority
You can now change the Mojang priority
Your not supposed to be able to change the Mojang Priority, they fixed it so that's why you can't change it.