This is a guide on how to fix losing your coins and losing your Propbox skins after you log off of PropNight.
How to Fix Coin Loss
After you play 2 matches of PropNight, Close the game and re-launch PropNight through steam and you will keep your coins.
Mods have said they will give 300 coin compensation for when this glitch is completely patched.
How to Keep Propbox loot
Before opening your propbox, Restart PropNight, then re-launch PropNight through steam and open the propbox.
This does not work for most people, but it works for some.