When lag causes a misclick or skipped action. The user isn't disconnected from the client though.

When a player is disconnected during gameplay, and often leads to being dropped from their event.

While drafting, lag causes a user to miss a pick or timeout from the draft.

I click on "play with kicker" on Emblazoned Golem, I pay 2 mana and it comes into play with 2 mana in my pool, not allowing me to pay the kicker cost.

For when there is client confusion or an issue that can not be reproduced or attributed elsewhere.

https://i.imgur.com/W2NJKqU.jpg

When my opponent cast distant memories on me it gave me no option whether to put the card in their hand forcing me to concede to end the game without fully conceding the match.

When a player is unable to submit their sideboard due, often giving an error message, and often for having having 14 or 16 cards in their constructed sideboard, or other various issues during sideboarding that aren't transitioning issues or the client crashing/becoming unresponsive.

Turn 2 in game 1 opponent played muscle burst on a 1/1 and on during resolution the whole game rewound on screen to waiting for dice roll resolution. Now the screen is locked on that and will not go back to where it was.

Whenever I sideboarded Wear/Tear into my deck Lurrus was not declared as my companion (as if it counted wear/tear as a permanent).

Raka Santuary does not recognize when you control a blue permanent and a white permanent.

When the User Experience or User Interface is involved in an issue. Generally not a technical bug, but where the client could be improved to help reduce confusion.

For when an issue occurs when going to or from sideboarding back to the duel scene.

hi mutual destruction is really bugged... i had creature and also enchantment with flash and game didn't give me the option to cast mutual destruction.. Also i had a creature with flash which is slitherwisp which gives you a card if you cast a flash card eventhought i cast mutual destruction as sorcery speed when slitherwisp in game it also didn't give me a card too .... please check this thing is really a bad bug..

When using Slimy Kavu, it turned my Opponents land into an island, not a swamp

Necra Sanctuary trigger abillity doesn't work properly.
When it triggers, and i have a white permanent and a green permanent, my opponent loses only 1 life, but he should have lost 3 life instead. Even if i have a multicolored permanent, that have both colors, green and white, it still doesn't work properly.
I try to build a deck around this card, but i can't play with the deck properly because of this problem,

just spinning. forever. I tried a fresh installation. I tried with a VPN connected to NY and that worked.

Steps Performed:
- Client restart
- Clean uninstall reinstall

First clean uninstall/reinstall resolved issue. Error message appeared again on second launch of client

Error message received:
Error reading XML card data. This usually means that you have a corrupted install folder or registry. Please uninstall MTGO from the add/remove programs menu, and then reinstall the application from the MTGO website.