That makes me wonder...
 

Why does a weapon just STOP working all the sudden, it happened to my servers Online Editor script, which was working then all the sudden it stops working! Now we have to survive with offline editor and our tileset wont load in the offline editor so basically our LATs job go ruined x_x

Oh, the magic of the offline editor!

Your tileset doesn't work in the offline editor because it's 24-bit, you can fix that easily with a featured image editor (Photoshop, GIMP, Paint.NET) or Irfanview, or saving it as a GIF.

Post the script that's breaking if you want help with it, it's unfair to expect us to solve your problem with no details except that it doesn't work anymore.

All I can suggest is..

1. Make sure the npc-server is running. Restart it if neccesary. (/npcshutdown then /npcstart)
2. Make sure you have the weapon in your attributes.
3. Make sure savelevels=true in server options.