I have the same problem as Remus. I just switched from PSE 10 to PSE 13. In PSE 10 I could enter a hex code for the color in the color picker. In PSE 13 this feature does not work properly. For example, you cannot, without extreme difficulty and luck, delete the existing hex in the color picker. Sometimes, if you enter your cursor into the text area of the hex box, you can delete some or all of the numbers, but this rare. Frequently, I get a pop-up box asking if I want to delete the layer. This pop-up box appears twice. Why this happens when I'm trying to change the hex code in the color picker is puzzling.
I've been using PSE for a long time and have always been able to change the hex code in the color picker. This is "bug" that needs to be resolved.