If you are running into issues where you are unable to move diagonally with the Tartarus d-pad-stick thing, the problem happens when you change the usage from the 4-way to 8 in Synapse. Not sure why it does this, and maybe Razer can get it figured out, but if your diagonal option doesn’t work, like trying to press W and A, or S and D, save your settings in the 4-way option and restart your computer. When your computer comes back on, it should be working normally. You can still change the buttons, like from WASD to the arrows, or whatever you want, but AS SOON AS YOU CHANGE IT FROM 4 TO 8 DIRECTION, even if you change it back, it will cease to work and you have to restart your computer.
Hope this helps!