I just got this bug, I can't sideout.

I can only see my deck if I remove the Companion, and even so its not possible to side in or out.

The deck countdown its 80/60 its not matching.

I'm a bit worried, since I'm planing play the Mythic Qualifier tomorrow.

Same issue happening to me. Lost my last two matches this way.

Same here, opponent disconnected / conceded / crashed / ragequit at lethal attack in game 1. Went to sideboarding waited 5 mins till restart. Afterwards game goes back to final attack of game 1 and is stuck there.

05-15-20 and the problem is still not solved

This sideboard issue is ruining traditional magic on arena

Had the same bug multiple times today.

I have a companion (since someone on the forums mentioned this being related).

The bug occurred when

a) Client is laggy because of memory loss > restart during sideboarding > bug

b) Randomly after finishing the first game in a Bo3 series > bug

c) After disconnecting from the client > bug

Is there a fix for this yet?

justo despues de usar el side al volver a la partida el juego se cuelga y no se puede jugar

Here too, lost 2 matches and went 0-2 in a traditional standard event

Same problem here. Sideboarding is not allowing me to make any change

Same here, log file attached
And it's constant... Everytime I get disconnected in a bo3 I can't sideboard at all.
Annoying since I don't want to play a top deck ( yorion + agent or cycling ) and rely on sideboarding to counter those top decks when encountered.

I cant move anything from the main board to the sideboard and cant even finish it by clicking done, have to wait until the time run out and play without sideboard

Same. Jesus Christ! 5 games I couldn't sideboard! I have a companion and everytime I went to game 2, I would sideboard quickly, click done, it would take a full 1:30 or 2 minutes or WHATEVER THE **** ITS MAXIMUM IS and then I WOULD HAVE MY ******* CARD I TRIED TO SIDEBOARD OUT STILL IN THE DECK. 5 matches. ******* it, I know it is just ladder but GOD ******* ******* WIZARDS

Same here. Running Windows 7

the same.
Did wizzards communicate ? dam bug.

I had the same issue. Game crashed at the start of the match. Managed to close and reopen in time to play first round then this screen came up during sideboard. Tried to close and restart twice with no effect.

Same as everybody else but I hope this is getting addressed especially before mythic qualifier

This happens every match I have a disconnect, which is happening A LOT right now (and it isn't my internet, it's Unity crashes and freezing...

Same problem. Can't imagine trying to play in a tournament requiring sideboarding with this happening. Disconnects are so bad right now too.

Same Issue. Sideboarded twice and both times it was the same after I got disconnected in game 1. I tried to login again during sideboarding before game 2 and nothing helped. It showed a 50 second countdown clock and no maindeck. I could see the sideboard cards and click them, but I was not able to submit with any deck configuration. When I changed deck views, my companion showed as a card type "Commander".

same problem for me