(I'm hoping to be in the right forum - otherwise please move it)
I'm working with SEBLOD 3.8.2 / SEBLOD Importer 1.7.1 and there is a bug with ALL pull down menues. If you klick the button to show all values you can see all the list of the selectable items but moving over the items WITHOUT PERMANENTELY PRESS THE LEFT MOUSE BUTTON the list disappears immediately.
Work around: press permanently the left mouse button!