Same here. Tried on web and on Linux app. Always get the message.

There was a problem saving the changes. :(

Please hit "Reload". If the problem persists, check out the troubleshooting steps for help with common problems.

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Hi there,
Sorry for the inconvenience! This was corrected earlier today (around noon UTC) and all list and sync problems should no longer occur.

Let us know if you're seeing anything else or contact us if you need any more specific or private help!