WSJT-X is frequently being updated and so is Hamlib.? The WSJT-X installation bundles a current version of Hamlib.
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I found that for a recent version of Hamlib the QRP Labs radios has been changed from one version that handled all QRP Labs radios to separate "QRPLabs QCX/QDX" and "QRPLabs QMX" radios. To add to the fun only the QCX/QDX one worked with my QMX, the QMX one caused WSJT-X to shut down.
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So if you have problems report the exact version and type of WSJT-X and the version of HamLib.? "The latest" isn't good enough, that's only the last one you found.
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Once you find a hamlib version stay with it, and as I said I found that the QCX/QDX version works with QMX, the QMX version doesn't.
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I'm using Hamlib version 4.6.1 2025-01-21T09:43:13Z, WSJT-X v2.8.0 20250314 Improved Plus.