Hello,
Since updating to Cornerstone v. 3.3.8 and X version 6.3.8 (on WordPress 4.9.8) I keep getting some weird CSS errors in the Cornerstone editor. In the usual sidebar, the top selectors are taking up the whole screen. (See screenshot).

When investigating the issue, I can ‘fix’ this by disabling some CSS ‘height: 100%’ code in the source of Cornerstone. (See Sceenshot).

The only way I can work with Cornerstone now, is to put it in the new bottom bar position (in which it seems to work fine).
This happens in different browsers (Safari and Chrome). Also tried emptying browser and server caches.
What could have gone wrong here?
PS In the meantime I’ve tried updating to WordPress 5.0, but this makes no difference…