When using texture references, clicking the minus sign (-) to remove a listed string inserts it into the "add reference" textbox at the bottom.
This was discovered when moving a set of scenery OVLs to a new theme, where the referenced texture OVL needs to be changed. The old name replaces the new name in the text box.
Work around: use the clear button to remove the old referenced OVL first, or add the new referenced OVL and then use the minus (-) sign to remove the old one.
Suggestion: if the suggested OVL name is different than what is saved in the SCN file, when creating the OVL there should be a warning
Better yet, a check to make sure that texture OVL (and perhaps the texture names there-in) should be checked upon creating a scenery OVL
-Vodhin
Vodhin.net