Thanks for the prompt response James.
I actually just checked to make sure that the “disable visual editor” was not checked:
https://screencast.com/t/RDBLpsNez0D5
If it’s not checked, try deactivating all plugins. If that resolves the issue, reactivate each one individually until you find the cause.
If that does not resolve the issue, try switching to the Twenty Sixteen theme to rule-out a theme-specific issue (theme functions can interfere like plugins).
I had done that prior to posting this thread.
Any other ideas maybe?