Live view shows grey panel

Hello. I downloaded Hueman theme. Did live view but get a grey screen where my posts and pages should be. Took about 40 seconds to present this screen (longer than normal).

Removed the theme and reinstalled.

Am using it on another domain on the same shared hosting plan without issue. Any known plugin conflicts?

I have been through and switched off non-critical plugins to test with no improvement.

Cheers.

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