debug.err
While trying to design a unit I noticed that two weapons kept being selected, the default club and the one I had explicitly selected (the upgradable range weapon in this case). After playing with it a while I figured out that this happens any time I go to the "Other" tab and change anything (shirt, hair, etc) and return to the weapons tab. this does not happen when i change the unit's traits.
Screen capture of the bug. Note that two weapons are selected. I also highlighted a minor polishing issue (the border does not align).

When you try to save the unit four thumbnails are missing as well. Two for poses and two for backgrounds. The two poses actually work when selected, but the backgrounds just return an all black background when selected:


For reference I installed the game on my D: rather than my C:.