My cards are no longer appearing on my boards, how do I solve this?

[Denyson Silva]

Since last night, my cards haven't been appearing on any of my boards. It seems like a bug; they appear completely as soon as I enter the board, and within a few seconds, all content disappears.

[Gaurav Kataria]

If you have a filter turned on, then you can turn it off https://support.atlassian.com/trello/docs/filtering-for-cards-on-a-board/