I've just started using blender. At first, my XP PEN was able to sculpt just fine using its pen. Now, however, the pen suddenly doesn't work when sculpting. The tablet recognizes the pen is there, as the mouse follows it. I am also still able to select buttons using the pen. I cannot, however, sculpt. When I use my mouse, I can sculpt just fine. Simply the pen will not work. I do not believe I altered any settings.
How can I fix the issue?