I am having a problem with some potions as well. The 1k potions will work, anywhere, on any key. However the 2k potions, worked for me yesterday but not today, will not work anywhere on any key. I am not in pvp, I let myself get down to 1k hp out of 4k max. The 2k potion will not work in any way, while the 1k potions will work fine.
Sent in a ticket, but no response yet. Are your potions 2k potions as well?
okay I have fixed my problem thanks to another thread. basically the bottom potion is bugged in a stack. to fix it you have to do this.
put all your potions of the type that is bugged into your inventory. split the stack (shift click and drag). the half that ends up on your cursor move to somewhere far away from the original stack so you don't get them mixed up.
continue splitting the original stack until there is one left in it. that should be the bugged one. keep it separate, and move all the split stacks into a single stack and pop onto your bar. test them to make sure they are working. if so then sell the bugged potion and you should be good to go.
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Sent in a ticket, but no response yet. Are your potions 2k potions as well?
put all your potions of the type that is bugged into your inventory. split the stack (shift click and drag). the half that ends up on your cursor move to somewhere far away from the original stack so you don't get them mixed up.
continue splitting the original stack until there is one left in it. that should be the bugged one. keep it separate, and move all the split stacks into a single stack and pop onto your bar. test them to make sure they are working. if so then sell the bugged potion and you should be good to go.
credit to adventironcast from here
http://nw-forum.perfectworld.com/showthread.php?213292-Potions-of-Lesser-Healing-won-t-work-and-trigger-my-daily&highlight=potions