Okay, I've been beset with numerous occasions where I get that infernal message "There is something selected which is not in view. Do you want to insert your xxx next to this?" and I always answer "yes". I've also noticed that I have to continually fiddle with the zoom level (between 25% and 150% just to get the text item to open for editing, when hitting the Enter key. I think I found out that this was due to the selection/cursor being close to the edge of the display.

I went into the following dialog in the File/Preferences menu, and in the Score Position page set the following items:

Score Position 

During Input and Editing 
Follow selection  - checked
During note input, follow caret  - checked
Center selection  - checked
Avoid tool windows  - checked
View whole width of system - checked
View whole height of system - checked

After setting all these, I no longer got that Item next to" message and was able to open any text item, system or staff, at the zoom level I was in (which in my case I keep at 62.5%).

I think the root cause of my pain was the "centered" one. It sort of makes sense.

It's wonderful, editing now. Gotta go and write some chords...