Classic Editor: “Add Media” Button Not Working From Add Post/Add Product Page

Hi All,

Since we updated WordPress t0 5.5.1 from 5.3, we were not able to add media from the post page or wu commerce add product page.

Troubleshooting so far, after googling a bit and reading in this forum a bit:
– tried in Chrome and Firefox
– disabled all Plugins
– switched to Twenty Nineteen theme
– tried adding the following line to wp-config:
define(‘CONCATENATE_SCRIPTS’, false );
– Reinstalled: 5.5.1–en_AU

Screenshot: http://prnt.sc/ulk293
Log:

wp-auth-check.min.js?ver=5.5.1:2 Uncaught TypeError: Cannot read property 'hasClass' of undefined
    at HTMLDocument.<anonymous> (wp-auth-check.min.js?ver=5.5.1:2)
    at HTMLDocument.dispatch (jquery.js?ver=1.12.4-wp:3)
    at HTMLDocument.r.handle (jquery.js?ver=1.12.4-wp:3)
    at Object.trigger (jquery.js?ver=1.12.4-wp:3)
    at HTMLDocument.<anonymous> (jquery.js?ver=1.12.4-wp:3)
    at Function.each (jquery.js?ver=1.12.4-wp:2)
    at n.fn.init.each (jquery.js?ver=1.12.4-wp:2)
    at n.fn.init.trigger (jquery.js?ver=1.12.4-wp:3)
    at Object.<anonymous> (heartbeat.min.js?ver=5.5.1:2)
    at i (jquery.js?ver=1.12.4-wp:2)

Appreciate any help and suggestions! Thank you in advance!

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