E-book viewer issues after 3.16
When Calibre updated to 3.17 I discovered the E-book Viewer was no longer working correctly for me on my MacBook. When viewing epub's, it opens the E-book Viewer window and displays a large blue square with ? in the centre. Unable to view the ebook at all. When viewing a mobi or azw, similar and it will mostly display the text, but has trouble with some content and doesn't display images within the ebook. Same problem with 3.18, 3.19 and 3.20. When I revert to 3.16 the viewer works fine again. Have renamed viewer.json and let it be recreated, but no change.
Has anyone encountered this issue before? Happy to leave on 3.16 for now but would like to figure out what's causing it. Thanks.
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