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Troubleshooting covers the checks to run first and how to report a problem.

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Claude is open

A Claude Desktop change stops with app_open, and changes nothing, while Claude is open:
Closing its window leaves it running. If the error says Claude has quit and names a part of it still running, such as ShipIt (pid 812), wait until it ends. Or quit it in Activity Monitor. Then try again.

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A parked Claude Desktop account opens signed out

After a switch to a Claude Desktop account, Claude shows its sign-in page: the parked login no longer works. pitboard may already have said sign-in may have lapsed. Quit Claude, then sign in to the account again, so Pitboard records the new login.

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The data folder holds an entry Pitboard has not read

pitboard doctor warns on its Claude data folder layout line, and Pitboard starts no Claude Desktop move, refusing with login_folder_unknown:
A build of Claude made an entry Pitboard has no record of, so Pitboard cannot tell whether it belongs to the account. Update Pitboard. If no release reads it yet, report a problem with the name. Claude Code and Codex switches go ahead.