user16138: Can someone explain to me, why on chess24.com white cannot castle in the situation in the picture? King never moved, neither did either of the rooks. When the queen was moved to d2 castling was not allowed queenside either. When I take the moves from the game and import to lichess, castling is allowed there. What am I missing?

user17372: It seems to be a bug. Lost 2 games today because I could not castle
Edit They changed the way you castle. You have to click on the rook now.

user224: After clicking on the king, the rook is outlined in green, as shown in your both your own image, and mine below. 
If you click the rook after clicking the king, castling will occur, shown in the image below:


16138: <p>Can someone explain to me, why on chess24.com white cannot castle in the situation in the picture? King never moved, neither did either of the rooks. When the queen was moved to <code>d2</code> castling was not allowed queenside either. When I take the moves from the game and import to lichess, castling is allowed there. What am I missing?<a href="https://i.stack.imgur.com/HZ4Kv.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/HZ4Kv.png" alt="enter image description here"></a></p>
 17372: <p>It seems to be a bug. Lost 2 games today because I could not castle</p>

<p>Edit They changed the way you castle. You have to click on the rook now.</p>
 224: <p>After clicking on the king, the rook is outlined in green, as shown in your both your own image, and mine below. <a href="https://i.stack.imgur.com/3ihA6.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/3ihA6.png" alt="Chess24 with castle option highlighted"></a></p>

<p>If you click the rook after clicking the king, castling will occur, shown in the image below:
<a href="https://i.stack.imgur.com/dQRBb.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/dQRBb.png" alt="Chess24 after castling"></a></p>
