I'm having a problem whenever I use my brush tool. Every time I'm painting, when I try to "build up" the paint, it stops blending and nothing with happen. Unless I put full pressure onto my tablet pen, the stroke comes out, but it looks choppy, jagged and hard - no blending. I checked all of my brush settings, restarted photoshop, made sure photoshop was updated, and even went as far as copying and pasting my layers into a new file in case the original was somehow corrupted. This problem also happens with and without the transparency as well as when I adjust the opacity. The layers are also unaltered and all set to Normal. I've tried this with both CS5 and CS6. I've done loads of paintings before and have never had this happen. Has anyone heard of this?