I have created 3 Leagues in myHuddle (2 are offense and IDP, one is offense only), but there is one IDP League that I cannot view, I get the Invalid Request message....unless I set that problem League as my default league. Then I can see the offensive cheat sheet, but when I click Go To IDP Cheat Sheet, the Invalid Request messgae pops up.

Does the league you are having problems with have the same name as one of our preset leagues? That's likely your issue. Unselect that league as your default, delete it, then recreate it with a unique name.

I made another league and named it "ESPN League" instead of "ESPN", and now eveything works fine. Thanks.