I purchased the PRO version VERY VERY recently, I got this software a week ago. It WAS working fine...I was drawing for a friend and then I wanted to start adding details on the hair, I picked the airbrush (layer clipped to hair) and it wasn't working, the airbrush size wasn't changing when I wanted it to. I added a new layer to test, nothing happened... I started with the pencil brushes and nothing happened either. I did exit the software and came back, 4 times. I did also let my computer shut down the entire night and it's still not working... I spent at least 2 hours doing the lineart with the hair coloring :c I'm a bit disappointed... could I get a little help in fixing it? (I did check all brush settings and layers settings...) oh and another weird glitch I've noticed is that my pen is... going weird places in the software??? I mean when I'm going to the taskbar to switch to another software, my pen automatically like... goes back... this is also the case when I'm hovering to the layers (or the right colloum of CSP's window) This happened the same to Krita (another painting software)