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I have seen this posted in a thread
Photoshop CC 2014 changes stylus use to use Microsoft system API's, with these API's you need to have Windows Ink enabled. These API's give better stroke results and improve the out of the box experience for users using Windows tablet/convertible devices. If you want to go back to the old WinTab implementation of previous versions do the following:
Create a file that contains instructions to revert to the WinTab functionality.
Create a text file in a text editor such as Notepad.
Type in the following lines:
# Use WinTab
Save the file as a plain text file named PSUserConfig.txt, and save the file into the Photoshop settings folder: C:\Users\[User Name]\AppData\Roaming\Adobe\Adobe Photoshop CC 2014\Adobe Photoshop CC 2014 Settings\.
To turn off the gestalt's functionality, delete the PSUSerConfig.txt file. Or, move it to a different folder if it doesn't contain any other commands, or change the lines so they read:
# Use Win8 native tablet support
I've enabled Windows Ink (which I confess to not really understanding its function and so had not previously selected it) and the Pen Pressure/Tilt/Opacity/Flow are now active.