So, I'm playing with quickcast and I noticed that casting is not instantaneous anymore. It's like smartcast on 
Varus q, where you hold q then release to fire. It shows the area where you can target with a targeting cursor and all, as if it weren't on smartcast, but its not supposed to be like that i.e. not instantaneous . This has really messed up my gameplay, and I lost several games indirectly because of this. Am I the only one with this problem?
Bump, I also have this problem. Would like a solution because playing with smartcast has become a huge problem.
Edit: Am currently repairing game using the in client repair button, will post results. Edit 2: Repairing game does NOT fix the problem.
OP, will you post your computer specs?
I'm running: Windows Vista Home Premium (32 bit) AMD Phenom(tm) 9600 Quad-core processor 2.30 GHz 4GB RAM NVIDIA GeForce GTX 650
I noticed having these problems once 6.6 rolled out.
UPDATE: I HAVE FOUND THE SOLUTION!
In the hotkey menu (the one that you set spells to be quick cast or not), there is a section at the bottom called "Quick Cast With Indicator" If you have hit "Reset to default" recently, then it checked the once that says "Replace Quick Cast with Quick Cast With Indicator in the quickbind UI"
Make sure both boxes in this section are unchecked and you will be back to spell slinging like normal.
