[Dysfunctional Weapon Plaques and Racks]

I've noticed weapons racks initially working when I first put a weapon on them, but once I remove the weapon by clicking on it in game, the rack stops functioning - can't put anything else on it. This seems to happen more when I use a crafted weapon or mod weapon rather than a just plain vanilla one. The way I worked around the bug on the pc was this:

 

Press ~ to open the console.

Click on the weapon you want to remove so it's ref id is now displayed.

Enter "disable"

Enter "moveto player"

Enter "enable"

Press ~ to close console.

 

The weapon should now be on the floor next to you (off the rack), and the weapon rack will allow other weapons to be placed back on it.

 

This fixed it for me. I'm using a weapon rack in the Skyfall Estate player home mod. I thought I wanted to display a shiv from Cidhna Mine near the mannequin wearing the (useless but cool looking) Old Gods armor set, but the tiny little thing didn't look good there. I couldn't activate the weapon plaque to remove it until I tried this trick.

 

Thanks @SplashDamage!