I have them set properly (I set them the way I always have in the past anyway). Normally when I haven't had them set it doesn't even let me get to the export screen. In this case, it lets me select format type, save destination, everything else, then instead of getting the progress bar I get an error.
Guess I was wrong then. Mine goes red when I do that if I remember right. Not sure. Been a long time since I made that mistake. I no longer drag the markers. I use ctrl-1 and ctrl-2 to set them