I also wanted to add, I am playing a healer since game was in beta, cleared all content on scholar and never encountered this problem. I did hear something about white mage heals not landing, but never experienced this, and after a while I thought it was fixed. I have however healed with mouseover macros on my other two healers. I just couldn't be bothered with macros on my astro yet (and I thought it will be more reliable if i get used to healing this way).
I suppose, since we can't recreate it, I cannot report it to bugs? Or would recording be enough?

Nadirah
Am I the only one that heals light parties with F1-F4 to target players?
While this is a great idea for 4 man parties, 8 man content seems impossible for me to go f1-f8.