Ben Reiniger wrote on Tue, Jan 26, 2016 07:09 AM EST:
Can you describe exactly what happens when you try to submit an edit?
You said earlier that perhaps it's because the text boxes contain too much.
Apparently that is possible, if unlikely: the maximum size of a "text"
type entry in our database is ~65000 characters.
I would not expect it to have anything to do with whether the item has been commented on or not.