Question Attachment Button Does Not work and BBCode Wysiwyg editor missing from post entr

We have used Kunena for quite a long time without any issues, but it seems that recently with updates we have lost the functionality of the "Attachments" button and the nice Wysiwyg editor bar like I see above while typing this is missing as well.

I'll include the report configuration here. I also see an error in the console:
Uncaught TypeError: $.widget is not a function
at jscss.php?f=549b494f8395cb250588ef622b8f911b-cache-plg_jch_optimize-367a32d295dd3dc3f9fda80a0f393cde&type=js&gz=gz&d=30:30
at jscss.php?f=549b494f8395cb250588ef622b8f911b-cache-plg_jch_optimize-367a32d295dd3dc3f9fda80a0f393cde&type=js&gz=gz&d=30:29
at jscss.php?f=549b494f8395cb250588ef622b8f911b-cache-plg_jch_optimize-367a32d295dd3dc3f9fda80a0f393cde&type=js&gz=gz&d=30:29

I think this is related to the JCH editor - I'm wondering if there is a conflict here?
Joomla, Kunena and extensions are all up to date. Any help you could provide would be appreciated.

Thanks!

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Kunena version detailed: Kunena 5.1.5 | 2018-10-14 [ Rhea ]
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