Solved

the "my leagues" button...

...doesn't actually show you all your leagues. It only brings you to the first league you created with your account. It would be more convenient if it brought you to a page where you can then decide which league to look at

I know in old iGP there was a 'my leagues' button, but I don't see one in this version...which button are you speaking of?

Oh wow! This is the second time that I seem to have a button or option that other managers don't have.
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I don't know if it this button was supposed to be visible to everyone

I don't see that, even when I sign in as other hosts.

Haha, I'll have to get Jack to investigate why this button isn't available for all hosts.