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I don't know if this is just a freak random occurance, but on two occaisions, I was unable to use any skills, which really sucks when you're an fs assist partnered up with an AoE'er.
At first, I started using F1 to Heal, but felt it wasn't fast enought, so I tried using and combination of F1 and the action slot to Heal, and suddenly, I find that I am unable to Heal or use Circle Healing or anyother skill. I wasn't sure why it happened, maybe something wrong with my keyboard, but double clicking on skills did not work either, and I was still able to type (so that I could apologise to my partner that I was reduced to being a useless leech). Logging out did not help either. Initially thought that spamming Heal somehow causes the skills to lock up (like in MapleStory, if I repeatedly use one skill, all skills will stop working for a while). After a while, I would find that I could Heal again, but then the same thing will happen again. Naturally, my partner got fed up and found someone else to level with.
I tested this by spamming Heal on myself for 5 minutes by pressing F1. Skills did not stop working. So I figured it must've been a freak accident or something and was safe to go back to fs'ing.
The second time it happened, it was soon after I filled the action slot with Heal and used that instead of spamming F1. I think that the cause is using Heal in the action slot. Normally I put buffs in the action slot, so that when someone walks up and says "buff pls" I can quickly buff them then get back to what I was doing. Although it'd be useful to be able to cast multiple Heals quickly, to stay on the safe side, Heal stays out of the action slot.
Has this happened to anyone else? Is it possible that the reason why I was unable to use skills for a while due to using Heal in the action slot? Or is there another explanation?