npcs not working?

Yesterday, i was able to use my npc car dealer and shop dealer fine, like going up to them to purchase an item by pressing e on them and the menu will pop out. But my friend couldnt access the npcs, he was pressing e and they wouldnt work. After i turned off my server and back on, i too was unable to use the npcs.

Does anyone know why this happens?

If you bought the item off of coderhire or scriptfodder, contact the person who made the addon.

Its not from them

[editline]7th November 2014[/editline]

What’s weird is if i tase them or spawn a new npc, it works. Both npcs are from different developers, so its problem on my side.

[editline]7th November 2014[/editline]

almost as they need to be refreshed to work again