Changing Map Labels in PzC

[76mm]

I've been messing around with the sub-map creator for a couple of the PzC games (Smolensk, Sicily), trying to revise various of the labels (delete some, change others, etc.). Supposedly this is one of the functions of the submap editor.

Unfortunately, from what I have seen, while it is possible to add new labels in this manner, the old ones also remain on the map, even if you deleted or revised them. Has anyone else encountered this problem?