Just updated my Photoshop to Photoshop CC18 and now I am not able to define the size of my brush with my wacom pen. Using the right mouse key + ALT , it works as it is used to be but using the pen + ALT (using the button as right mouse key) I only can choose a colour. Can anyone help me ?
Ok I found a solution for Photoshop. Create a file named "PSUserConfig.txt" and this file add the line "UseSystemStylus 0" (without the quotes). Then copy this file to C:\Users\<your username>\AppData\Roaming\Adobe\Adobe Photoshop CC 2018\Adobe Photoshop CC 2018 Settings.
Finally in the Wacom drivers create a profile for Photoshop (if you haven't already) and then go to "Mappings" and uncheck the "Use Windows Ink" checkbox.
These changes will make PhotoShop use a different API for accessing the stylus (WinTab instead of Windows Ink) and with these changes I managed to get both pressure sensitivity and my pen+ALT functionality restored