I am manually replaying the 1952 season without any problems like you describe.
For instance, I am currently setting up starting lineups for my next game. Larry Jansen is correctly shown as the starting pitcher for the Giants’ June 19th game vs Pittsburgh.
But if I wanted to choose another starting pitcher instead… I would simply go click on his name (ie. Al Corwin), drag it across and drop it in place over Jansen’s name in the #9 spot, then click the blue "NEXT’ tab on the top right.
And Corwin would then be the Giants’ starting pitcher instead of Jansen…
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