Expanding/Collapsing code blocks not always working

[derian00]

See the attached image, you can very clearly see the problem, I can solve it by fighting to expand all the boxes, then re-collapsing them all, just updated to 21.1 build 15413 but was also happening on the previous version I was running.

Suggestions on how to fix this? Extremely frustrating and wastes a lot of dev time.

[Nancy OShea]

Validate code and fix any reported errors.

https://jigsaw.w3.org/css-validator/

If code contains no errors, try Restore Preferences.

https://helpx.adobe.com/dreamweaver/kb/restore-preferences-dreamweaver.html