Hi again,
May be off topic but, since it is something happening in Axure 8 & High Sierra… Actually there is another rather annoying glitch I am experiencing with Mac & 8.1 & High Sierra : sometimes, clicking on an element in Axure in edit mode (not in published prototype), does not select it. It takes several clics on the item to actually get it. It also happens clicking on the DP state modal window in order to select and edit that state (in this case it is a double click). As I say, this does not happen always, like 1 on 8 times, but it’s mostly annoying.
Tested with 2 different mouses (BT and wired) and with 2 trackpads (macbook’s and apple external)