I've suddenly run into a weird problem when right-clicking on the weaver guild supplier and the Ul'dah tradecraft vendor. When I click on them, nothing happens, except my hotkeys flash. The window that should typically pop up is nowhere to be seen. This is only happening with these two NPCs as far as I can tell. Other guild suppliers and tradecraft vendors still work fine.

I've reset the game, and the PC to no avail. Do you think something is buggy with the files? Any suggestions or help would be much appreciated. Thanks.