Hi,
I have an issue which is difficult to explain exactly when and how it happens, but have had it on multiple sites.
Sometimes when a change is made, possibly by navigating in Cornerstone to Global Options or Font Manager and then back to the tab which is open, the preview scrollbar disappears and it is not possible to scroll down the page without refreshing the browser.
In this screenshot I am rebuilding a website created in 2017, hence the Classic Row showing. All core and plugins are fully up-to-date.
Thanks,
Christopher