Editing and saving existing HTML document gives error : "operation impossible - file is modified"
It seems that sometimes when editing and then trying to save an updated .html document within a course, it enters in some kind of locked status and gives the error "operation impossible - file is modified".
This will then happen every time when the same document goes into edit mode.
I tried to delete the document and then re-import it, however the same error still occurs when trying to edit it.
See attached .jpg showing the error.