Hi, if you update your drivers to the latest on Huion's website, it should re-enable the pen pressure - worked for me anyway. Although, it doesn't work right away for Photoshop 2014 edition - a text file needs to be created.
Don't know if I'm allowed to post this but here's the text file info anyway, for anyone else
Create 'PSUserConfig.txt' in C:\Users\[username]\AppData\Roaming\Adobe\Adobe Photoshop CC 2014\Adobe Photoshop CC 2014 Settings
and put the following info in it
# Use WinTab
save and load PS 2014 back up. Found the info on deviant art.
Hope this helps someone