My last working vers was 14.2. It does not open now. First 2 or 3 times i saw the splash. After that it never came there. Nothing. I've updated my graphics driver (AMD Radeon R7 200. My RAM is 32 GB and working with Intel i7 6700) Result is the same. Other apps are normal as i've tried Photoshop, Illustrator, After Effects and InDesign.
I had a similar problem or Media encoder (Mac OS). I ended up deleting all preferences, any Plist files as well as anything that had amc (adobe media encoder) in the file name. Had to do this in both general settings and admin level. Also try opening with the option to delete preferences.
To reset preferences, follow this step:
Press Alt (Windows) or Option (Mac OS) while launching Premiere Pro. You can release the Alt key or Option key when the splash screen appears.
To reset preferences and plug-in cache at the same time, hold down Shift-Alt (Windows) or Shift-Option (Mac OS) while the application is starting. Release the Shift-Alt keys or Shift-Option keys when the splash screen appears.