Does this server really not have hotkeys for moving forwards/backwards? How can a BASIC feature like this be still missing after all these years??? I'm pretty sure every other server has the arrow keys for this task.

Backwards and forwards to what? I never use the keyboard anyway, unless I am typing a message.

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Still officially AGA 5d but I play so irregularly these days that I am probably only 3d or 4d over the board (but hopefully still 5d in terms of knowledge, theory and the ability to contribute).

To go to the next / last move.

But this is a discussion forum. There are no moves. I assumed you meant either the next thread or the next page in the thread and it was not clear which.

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Still officially AGA 5d but I play so irregularly these days that I am probably only 3d or 4d over the board (but hopefully still 5d in terms of knowledge, theory and the ability to contribute).

This is a discussion forum about Tygem

Oh, I never look at which forum - it's all one to me. All I do is look at unread posts. Still seems like it would be better to ask "does tygem have hotkeys?"

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Still officially AGA 5d but I play so irregularly these days that I am probably only 3d or 4d over the board (but hopefully still 5d in terms of knowledge, theory and the ability to contribute).

It's not the server, but only the client, that handles moves navigation on your device.
And, did you try to click on all possible hot spots on your screen ? Maybe the board ? The text input box ? Etc.Because the UI designers of certain clients have a completely different understanding of what constitutes good user experience and aesthetics.

I tried clicking everywhere. Still can only use mouse to go back/forward. Also the arrows are actually hidden inside the "Review" menu, which for some reason doesn't happen when you open the game as a relay room. Really weird design choices.

Huge understatement.