Quick Reply window goes blank when previewing post/going advanced

[JeteMc]

Wondering if anyone else is having an issue with the Quick Reply window going blank when previewing post/going advanced? I have had this happen occasionally over the last week or so, and don't know if it is something to do with the site, with my browser (now using Edge) or if in my senility I am doing something wrong.
I have also noticed that I have to view posts by using "Open in new tab" or else I get the "Sorry - no matches. Please try some different terms" message when I try to page "back" to the search results list. I pretty much attribute this to now using Edge, but thought that I would make mention.

[TMS]

Suspect not. I've experienced it occasionally when editing my posts, for example, to correct an error. That's using Chrome. Slightly different but enough to make me think it's the site.