FAQ & troubleshooting
The page loads but games won’t start (web)
Section titled “The page loads but games won’t start (web)”The web engine needs SharedArrayBuffer, which requires cross-origin
isolation. The app shows a toast and a console error when the host is
misconfigured. On manabrew.app this should never
happen — report it on Discord. If you’re
hosting the client yourself, see
hosting the web client.
Card images don’t load
Section titled “Card images don’t load”Images aren’t shipped with the client — they come from Scryfall at runtime. If images are missing, check your connection or whether Scryfall is reachable from your network. Game rules keep working without images.
A card did the wrong thing
Section titled “A card did the wrong thing”Probably a gap in the Rust engine — these reports are the project’s lifeblood. Post on Discord or open a GitHub issue with:
- the card name(s) involved,
- what happened vs. what should have happened,
- your deck list (export it from the editor),
- roughly when in the game it occurred.
Why is a card marked “unsupported”?
Section titled “Why is a card marked “unsupported”?”The Rust engine doesn’t implement everything that card’s script needs yet. The deck still saves; the card just won’t behave correctly in-game. See Formats & limitations.
Can I play offline?
Section titled “Can I play offline?”On desktop, the engine runs locally but card images still need internet. The web client is not offline-capable. See the web vs desktop comparison.
I closed my tab mid-game — is the game lost?
Section titled “I closed my tab mid-game — is the game lost?”Reopen the app within the room’s reconnection window (30–90 seconds, set by the host) and you’ll be put back in your seat. If the host disconnects, the game ends and the room returns to the lobby. See multiplayer.
Where are my decks stored?
Section titled “Where are my decks stored?”Locally, in your browser’s (or the desktop app’s) storage. Nothing is uploaded. That also means clearing site data deletes them — export decks you care about.
Is this free? Is it official?
Section titled “Is this free? Is it official?”Free and open source, GPL-3.0-or-later. It is unofficial fan software — not affiliated with, endorsed by, or sponsored by Wizards of the Coast LLC or the Forge project.