I am trying to edit the frequency of a play already added to a playbook with the greed addition or red subtraction buttons, but neither are working. I remember in the 2020 version I couldnt edit the frequency of plays in a playbook, either.

We've fixed this for a patch... right now they don't work if you sort a column first, so using the buttons without sorting is the current workaround.

Even without sorting first, if I just click "Custom Playbook", and select a playbook, then go to click the plus/minus, they are completely unresponsive. The only workaround I have found is to remove a play, then re-add it, and modifying the play weight when first adding it. This seems to be the only way I can find to modify these figures.

EDIT-
On plays which have a greater than 1 Freq, I can click subtraction to successfully reduce frequency

This was supposed to be fixed in .5 right? Cuz I still can't click on them. Went to STRATEGY->CUSTOM PLAYBOOK->(select playbook from drop-down)->Plays displayed below, plus/minus signs visible, however cannot be clicked on.

I did not sort or press any other button after selecting the playbook as indicated above. I even made sure to select a play and then try to click plus/minus to no avail...

I'm not able to reproduce this in debug or in steam released version. Are you using custom plays or mods? I may need your league file and any mods you installed shared somehow so that I can try and debug.

No custom plays, no mods. Can I email you the appropriate files? Which do you need?

If you can recreate it on a league file then share the .bin either through googledocs/onedrive or hop on slack and share the .bin file there. Does it happen with all of your leagues, or just certain ones?