Problems editing products/categories after update

[StormIT]

We've recently updated to Joomla 3.9.19 and Virtuemart 3.8.2 10325 but when trying to edit Products / Categories (just from clicking on their name in the backend) we're being shown a page with no styling and can't do anything. Any ideas please?

Screenshot attached

[AH]

Check in console to see if you have a javascript error or something of that nature

looks to me like your css file is not being loaded

[StormIT]

So it appeared that PHP7.2 was to blame. I changed PHP back to 5.6 and the page loaded correctly?

[AH]

php 7.2 should not be an issue  - i run on 7.3

[GJC Web Design]

yes -- is fine on php7.3

Possible its a 3rd party plugin causing the failure .. switch all off or turn up error reporting to find