Apex Listener 2
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Error: TypeError: $ is undefined
Source File: http://localhost:8080/i/libraries/apex/minified/desktop_all.min.js?v=4.2.0.00.27
Other regions types tried worked ok.
This is a problem with the APEX Builder Plugin
I switched it off, and there was no longer an issue - perhaps a difference between 4.1 and 4.2
This error happens a number of locations within the builder.