The following is a link to a game log I looked at where the arrow-buttons didn't work today (other game logs I tried, so far, didn't have the problem, now that I looked at a few more of them) - it's for a CV played on an 8x8 board with 4 armies controlled by 2 players, though I didn't check too carefully how it renders the diagram (says PNG in one place), as it's not a preset I made myself:
The following is a link to a game log I looked at where the arrow-buttons didn't work today (other game logs I tried, so far, didn't have the problem, now that I looked at a few more of them) - it's for a CV played on an 8x8 board with 4 armies controlled by 2 players, though I didn't check too carefully how it renders the diagram (says PNG in one place), as it's not a preset I made myself:
https://www.chessvariants.com/play/pbm/play.php?game=4-Handed+Chatarunga&log=panther-zcherryz-2022-123-934