So I'm trying to find what they changed with the hotbars and tried experimenting on things but no dice, and no changes seems to be made in the patch notes, but for some reason I can't switch hotbars when I'm doing an action.

I play my DRG a lot, and maximizing on it, requires to do moves inbetween your GCD skills, and I obviously have to do it fast, thus my skills are in different hotbars, I just did Titan EX right now and immediately saw the difference, while I was doing heavy thrust and was about to prepare to use my buff (which is in another hotbar), it wouldn't let me. I tried spamming it while doing so and it only let me change hotbars when the animation has halfway done. I normally use the shortcut keys L1 + triangle and L1 + circle to switch between my hotbars but I can't seem to do that anymore.

Is there someone out there that knows how to change it back to before, or if this is some sort of bug that needs to be fixed?

On a side note though, I can switch my hotbars normally outside of battle, it's when I use skills that it stops responding. I still don't know if this is a bug or not, so I held off on reporting it as one.