When trying to delete an existing sector/system note by deleting every character in the note then clicking 'ok', the note remains unmodified (i.e. the note is only changed if there is at least one character when the 'ok' button is pressed).

This only happens while editing a sector note by selecting it with the cursor and pressing the 'A' key to edit it. The behavior is correct from the "List Notes" dialog (accessed by pressing the 'L' key on the nav screen), and notes CAN be deleted either with the "Delete" button or by pressing the "Edit" button and deleting all characters as described above.

Ok, fixed in next update. it was trying to handle the case where you opened the window but didn't type anything in and therefore not save it. I changed it to check to see if the text is different than it was and save it if it is.