Pinegrow 5.92 Linux hangs opening a URL

Pinegrow 5.92 on Linux Mint 19.3 (Ubuntu 18.04 LTS) hangs opening a URL. The UI is completely frozen and unresponsive with “Loading, please wait …” spinning for a couple of hours.

The URL may require HTTP Basic Authentication but there was no prompt displayed.

Have previously opened other URL’s that didn’t need authentication without issue.

Thank you,