Monday night roster change
I did not change the rules in my fantasy, but tonight I could not add Mason to my roster. With the last injury news, this is unacceptable. I have always been able to add a player up until the game starts. Fix this.

Hello John,
In leagues that don't use weekly waivers, managers must add a player by 11:59 PM PT on Sunday to use them in the current game week. Players added on Monday will not appear on your current week's roster. Commissioners can manually reflect these adds for players to be available Monday by going to Commissioner Tools >> Manage Other Teams >> Edit Rosters.
Thanks,
Product Support
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Cliff Willmeng commented
This exact same thing happened to me, leaving an open RB slot and literally costing me the game.
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Paul Ruff commented
Someone was able to do that in my league. They were actually able to drop Jonathan Brooks who is injured but his team played on Sunday while he was on the bench of their roster. Somehow they were able to drop him on Monday, pick up Mason, and then come back and beat me. I agree that you should be able to pick up a player like Mason and start them on Monday, but not by dropping a player whose team played on Sunday regardless of their injury status. They were taking up a roster spot.