Custom/duplicate Compressor 4 settings may not be preserved (FCPX Motion5)

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Apple have posted this as a Knowledge Base article.

Symptoms
Custom settings or duplicates of existing settings created in Compressor may not be preserved. This can occur if right after using Share > Send to Compressor from Final Cut Pro X or Motion 5, you create the settings, quit Compressor, and then quit the app that sent the project to Compressor (Final Cut Pro X or Motion 5).

Products Affected
Compressor 4, Motion 5, Final Cut Pro X
Resolution
To workaround this issue, quit the app that was used to send the project to Compressor (Final Cut Pro X or Motion 5) before quitting Compressor.

Alternately, you can create a custom setting in Compressor prior to sending the project from Final Cut Pro X or Motion.