Default [Q] Velis Brightness Control problem

Hi all,

I have a problem with Velis Brightness Control, that I'm unable to hit the confirm/cancel button in the notification panel. I wonder if there's anyone having same issue as mine?

I'm currently using Phoenix Rom 16.7. Which is a 4.3 custom rom

I have to be honest that I did greenify some system apps, and also manually turn off some apps through application manager. Could that be the cause of that? Is a wipe data/factory reset is going to help?

Hope someone can provide a solution soon and thanks in advance~