macOS: After upgrade to macOS 26, Jellyfin Media Player opens to a blank window

[belthesar]

Describe the bug
On a system that I had previously used Jellyfin Media Player on regularly, after upgrading from macOS 15 to macOS 26, when opening Jellyfin Media Player I would be presented with a blank window. It remembered the previous window size and placement, but none of the web UI inside the app would paint.

To Reproduce

• Have a system that previously used Jellyfin Media Player on macOS 15
• Upgrade the OS on that system to macOS 26
• Open Jellyfin Media Player

Expected behavior
JMP opens and presents my dashboard

Screenshots
None captured, unfortunately.

Desktop (please complete the following information):

• OS: macOS 26
• Version: 1.12.0
• Installation Method: Homebrew (via cask brew install --cask jellyfin-media-player)

Additional context
I was able to repair this state by deleting the contents of the folder at ~/Library/Application Support/Jellyfin Media Player.

Unfortunately, I wish I had kept logs and the config from the previously broken state for analysis, but I was a bit hasty. Might be worth keeping the issue around in case my experience isn't unique, but I don't expect this report will be sufficient to do meaningful investigation.