So I've been playing a lot of Tales of Tribute lately. And I've seen my fair share of wonky things--most of which I'm sure are known and will get sorted out before the game goes live.
But, just for the sake of posterity and not letting anything slip through the cracks, I'll just list a few of the most prominent ones that I've personally experienced:
1. ToT Tournament Questline and Kishka's Dailies
---I reached the Master rank and went through the questline on one character. This character was not my main character. So when my main character was needed to access Grand Master Murzaga in Ravenwatch Castle (quest-locked), I switched over and did the ToT intro quest on my main character. I planned to redo the whole questline, just because, but was stopped at the next quest. In order to progress, you have to beat a Novice NPC. I beat two, but the quest did not progress.
I am assuming that this is because one's rank transfers over between characters, and that playing NPCs below one's rank does not count for certain quest goals. A similar thing happens with Kishka's dailies, where, if you challenge a Novice and you are a higher rank, you will not get credit for the victory (I did not test if that was true of all lower ranks, or just Novice). I did eventually drop and restart the tournament quest, but I was met with the same result.
2. Stuck on Murzaga gra-Ghorn
---The Grand Master in Castle Ravenwatch seems to keep giving me issues. This was the first Grand Master I attempted to play after switching to my main character. I don't know whether or not what happened is related to my previous experiences in Point #1, but, for some reason, when I challenged her, she only selected one deck, and would not choose another. I could not interact with anything, and so attempted to exit the game.
After confirming that I would concede the match, I expected to just be kicked back out of the game interface. That did not happen. Instead, I was stuck on a blank table. So, naturally, I went into the Escape menu to log out--only to find that I could not actually click on any of the options when I did so, thus forcing me to window the game and close out of it manually.
I logged back on and tried again; the same thing happened. I logged back on and dropped my seemingly bugged quest and tried again. Still, the same thing occurred. So I decided to go off and find another Grand Master.
I eventually found Linyia at Shada's Tear and was able to challenge her. The match was ridiculously buggy (more specifics in the next point), but I got through it, somehow, and then went back to Murzaga. This time, Murzaga actually selected both of her decks, and the match went quite normally. After beating her, I expected, once again, to be kicked out of the game interface, but alas--I was stuck again, though now on a slightly-less-blank board. At least I could click on the Announcements option, but that obviously didn't help things, and I was forced to window and X the game again.
I have included a picture of that final end screen. (Unfortunately, I did not think to document the previous incidents where she was stuck on her card selection, as I didn't expect to be making a post about it, at the time.)

3. Patron/Deck Swapping
---Some of the cards seem to have an issue where they will take on the background appearance of other decks, but maintain their actual names and artwork (and effects). I first noticed this with the Hunding cards, whose backgrounds were swapped with those of the Psijic deck. This happened in multiple different games, even when (if I recall correctly) the Psijic deck was not actually in play. Unfortunately, this also happened before I thought to make a forum post or collect documentation. I'm sure I could replicate it, given enough time, but I don't feel like chasing bugs.
However, I DO have documentation for a more severe version of this bug, which I encountered when playing Grand Master Linyia. At first, I thought that it might just be confined to those two particular decks. But then I saw, in this game, that the Duke of Crows cards were appearing with a Red Eagle background, as shown here:

But wait, it gets worse. Call me inattentive, but it took me a good while into the game before I realised, "Hey, wait a minute... Those cards aren't even in the decks we picked..."
In the next screenshot, you will see that our selected Patrons were Rajhin, Celarus, Hlaalu, and Red Eagle. And yet, in the Tavern, you can clearly see a Saint Pelin card, an Orgnum card, and a Duke of Crows card--all of which have the Red Eagle background. And yes, as far as I can tell, all of these cards could be properly acquired and did indeed proc their actual effects when played.

(For those curious as to how I won this, I basically just flooded her deck with Bewilderment cards from Rajhin's favour once I realised that I was generating far too much Gold and hardly any Power. I bought a whole bunch of high-cost Taunts and had 4 of them on the board simultaneously, at one point. She was over 30 Prestige and I was trudging along in the teens before I had this idea. I basically wasted her Power on my Taunts, kept her from getting any significant resource generation with the Bewilderment cards, and and nickle-and-dimed my way to 40+ Prestige with the few Power-gen cards I had.)
Anyway, these are just a few of the crazy things I've experienced in Tales of Tribute. Like I said, I'm sure most of these things are already slated to be fixed once the server goes live. I just hope that the tournament questline will be made repeatable on multiple characters.