That was a good suggestion. I had some trouble with no pitchers being displayed when I looked for possible trades and it ended up being I had a filter on.
But in this case I checked in my roster page and no filters were selected and "All players" were shown. Thinking maybe it had a filter on but wasn't showing it I made one, applied it, and then cleared. But that did not fix the problem.
Dunno if it helps but I took (and compressed) a couple of screen shots.
This is the error message I get when I hit "Finish Today":
And this is my rather empty waivers and dfa lists.
Thought maybe those would help in case there's something I'm missing or not seeing.
PS: I'm off to work now so won't be able to test any other suggestions till tonight. I'll get back to it when I come home in about 8 hours.