Hey, I had the same problem and searching in the forums I found this. Now is working again. Hope it helps you too.
1. Create a file that contains instructions to revert to the WinTab functionality.
2. Create a text file in a text editor such as Notepad.
Type in the following lines:
# Use WinTab
UseSystemStylus 0
3. Save the file as a plain text file named PSUserConfig.txt
4. Put (copy) the file into the Photoshop settings folder: C:\Users\[User Name]\AppData\Roaming\Adobe\Adobe Photoshop CC 2015\Adobe Photoshop CC 2015 Settings\
5. Restart Photoshop and check the pen pressure and overall performance.