I'm having the same issue with Calibre ver 8.22 on Win 7 64 bit and in Mac OS 10.7. The jobs have all been Convert .HTMLZ to .MOBI files. I can stop the job with "Stop All Device Jobs" but no matter what I click to try to stop an individual job, I get the error message. Until ver 8.22, I was able to stop individual file conversion jobs.
This is the error message:
calibre, version 0.8.22
ERROR: No job: No job selected
I hope this helps.
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