For example go to the "linker settings : Link libraries". Take for example a project which has more then 1 library.
1) Choose any of those libraries and click edit --> empty selection text
2) adjust for example the second one --> the first one get's replaced by the 'adjusted second one' and the original second on remains in place
This is most probably due to rev 5124 :
allow multiple selection for libraries in compiler options for all operations (move, copy, delete...)
@Martin : it seems things are not ok with events :
event.GetString() and event.GetSelection(). Are you sure this can/should work as you were intended ??