You do do it in Hex,
Most of the time this happens to me it's because the scroll lock for the location i'm going to does not include where my PC's are loading. The scroll lock is a location of the map that is shown so say your scroll lock is the upper left block of the map and you are loading your PC's in the lower right part of the map you won't be able to see your PC's on the screen. As a test just make the scroll lock the entire map (0,0, maxX, maxY).
It could (though less likely) be that you aren't loading your characters in that locations events.
--JP