'Unknown error, please try again' when trying to spectate.
Me too, I can't start a new game, join an existing game nor open the deck editor.
Experiencing the exact same problem here aswell, but not only I am not able to spectate games, I also cannot join them.
Also, weirdly, if I host a game, I just keep seeing the loading box, then I turn off OCTGN, re-log and I can see in listed games my own game I've hosted. Funny.
In regards to this problem, I've did everything again - uninstalled, deleted OCTGN folder, installed again, rebooted and then when it didn't work - shut down. But the problem persists and this renders my ability to play any games.