List of known bugs
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[COMMENT DELETED]
Dec 20, 2017
0
#3
In Teams you can not castle if your teammate's piece attacks a square on your king's path or the king's destination.
Dec 20, 2017
0
#4
The board size is wrong (too large or too small) in different browsers. And it behaves very strange. For example, if you zoom in it in Opera the board becomes smaller, but if you zoom out, it becomes larger.
Dec 20, 2017
0
#5
If you resize a browser window the arrows are not resized, so they move to wrong squares.
I think the most annoying bug is not being partnered with the person you invited... sometimes even resigned games at the first move cause of that. other bugs are probably secondary (to me)
Dec 20, 2017
0
#7
UI: very sporadic, I click and drag piece, animation lags, so it appears piece doesn't move. I release click-drag, and repeat, but piece is frozen. Suddenly piece moves to square at which I originally released (as if my original click-drag worked). Mostly annoying when, upon not seeing piece move in original click-drag, I release over legal, but not desired, square.. and wind up making unwanted move.
This has happened maybe once or twice per game, at most.
another minor bug I have noticed is that there are some "bugged" games in the list on the right, games that are finished already or resigned on first move sometimes and stay there for days
Dec 21, 2017
0
#9
Top Games list is not sorted at all. Should be sorted by average rating of the 4 players or by strongest player rating.
The bug that occasionally puts you in the wrong team should now be fixed 
I just ran into a fascinating but which is new to me:
I invited a player to play with me on four player teams. It was taking a while for him to show up, so I decided to watch another game. Big mistake!
When my game started my screen started alternating between the game I had been watching and the game I was in, depending on who last moved. Needless to say that made it a little hard to play!!
Dec 29, 2017
0
#13
Thanks for this topic, Martin0. I think this should be considered a bug and added here.:
https://www.chess.com/clubs/forum/view/getting-matched-up-with-blocked-opponents
@Dragididdle, see my response in that thread.
UI glitch with the links at the top right corner, covering the name and score of the yellow player.
Browser: Brave, Resolution: 1280x720
I added the getting paired up with a blocked opponent among the bugs. It will get fixed eventually
is there something going on? the page wont completely load on my browser. it just comes in flashes and goes. I cant do anything
Yeah, that is a known bug @carpedem. We are working on a fix. In the meantime trying a different browser or trying again later seem to work for some people.
it's been 3 motnhs and the rating selector still doesnt work. This is reallly really really beyond what as I client I can accpet. Im cancelling my subsciption with chess.com. 
Here is a list of known bugs. Feel free to report any bug that is missing here or in a new topic. Posting bugs in the group notes are generally a bad idea since they are easily missed and forgotten.
General:
Flashing screen. It Switches between showing board and black screen (related topics: 1)
Occasionally unable to rewind to start of game (related topics: 1, 2)
Castling after captured rook (related topics: 1)
Unable to castle when rook moves over checked square (related topics: 1)
Some "bugged" games does not disappear from game list (see post#8, related topics: 1)
Top games list not sorted by rating correctly (see post#9)
Game does not start for some players? (related topics: 1)
You should not be able to get paired up with a blocked opponent (related topics: 1, 2)
Pieces can 'disappear'. You can't see them, but still move them (see post #27 and #29)
UI glitches:
Arrows after game still there (related topics: 1)
Copy names (related topics: 1)
Clock shows 0:59 instead of 1:00 for the player who has the move (related topics: 1)
Truncated usernames not fully shown when hovering the mouse as tooltips (related topics: 1)
Board size behaves wrong for some browsers (see post#5)
Arrows do not resize when resizing browser window and end up on wrong squares (see post#6)
Free For All:
No rating changes when the top score is equal (related topics: 1, 2, 3, 4)
Drawn games does not end (related topics: 1, 2(post #5), 3 )
Unable to move king next to a dead (resigned) king (related topics: 1)
Draws should be 10 points for all remaining players (related topics: 1, 2)
Dead kings should not be part of double checks (related topics: 1)
Teams:
A player can be put into 2 teams (related topics: 1, 2)
Can't castle while in "check" from partner, or the king's path/destination is threatened by a partner's piece.
Stalemate should be a draw, not a loss (related topics: 1)
New game board not showing when your spectating a game and a partner accepts your invite (related topics: 1)
username in invited player box stays the same and impossible to edit when using a different account on the same computer (related topics: 1)
Recent fixes:
The bugs mentioned below should hopefully be fixed and no longer be bugs, please report if there are still issues. For all recent changes, see the changelog.
Rating ranges now works correctly and is followed 100% (related topics: 1, 2, 3, 4)
The FFA/team mode option remember the last selection (related topics: 1)
The invite member field remember when made blank (related topics: 1)
Removed rounding error bug from FFA ratings