When adjusting alpha on a pixel from the color picker it's quite easy to "whiff" the alpha bar and replace your current color with black because the SV box's area for some reason extends several pixels below the alpha bar's. Demonstration in the below image:

I'd recommend the alpha

Suppose you have weapon A and B, A being equipped. Now you attempt to pick up weapon B. What happens is:

• Weapons are switched, which is the best option since there is no dual wielding.
• However, the drop/pickup code acts as if you now have two B weapons, turning the weapon on the floor into weapon A.

Basically, you have turned a B weapon into an A weapon.

EDIT: Reported for 0.9.1

Currently ViewModelMain is a big blob of code. It should be chopped into smaller sub-ViewModels.