This update includes an improvement to the way the Power Attack works.
In this new system, once you have a power attack activated, pressing the Power Attack button (middle mouse button or the R key by default) will immediately start the power attack even if you just started another normal attack.
Prior to his change, if your character started a normal attack you'd have to wait for it to finish before the power attack would start. This often resulted in either taking damage from a monster you should have killed or the power attack timer running out and missing your opportunity to do a power attack.
The new system will interrupt a regular attack if you have a power attack available and press the power attack button.
This update also fixes the bug where clicking the power attack button would completely fail to start a power attack at all.
This was a fairly significant change to the power attack system and in my testing it felt MUCH better.
I would love to hear what you think of the new system!