Trying to erase through a brightness/contrast layer and despite the brush being at 100% opacity, it is only erasing to about 20% opacity. This problem started when I was trailing the new PSE12. I decided to buy the upgrade in the hopes the bug would go away, but it hasn't. I have since deleted PSE8 from my computer and uninstalled and reinstalled PSE12 and the bug remains. I have reset my brush opacity using the CTL+0 and the bug remains. What can I do now?