We don't have any current open issues relating to Oxygen.
Can we get access to your site to see the issue for ourselves? We may want to take a copy for testing locally if that's okay.
I will mark your next reply as private so that I can get log-in credentials from you—you may want to create a temporary admin user for me to use that you can later delete. And be sure to have a current backup of your site.
Hi Nigel,
thanks for fast reply. Hereafter the credentials - you can change the user email if you want...
it's only a test site - so you can doo whatever you want...
It's important for me to know if toolset + oxygenbuilder will be my future combination for all my sites...
And I have checked the problem URL you mentioned above: hidden link
It does not load any CSS file from Toolset blocks plugin and WordPress blocks editor, see my screenshot: css-files.JPG
So the problem is abnormal, I suggest you check these:
In case it is a compatibility problem, please deactivate all other plugins, and switch to wordpress default theme 2020, deactivate all custom PHP, and test again