P: Start Workspace not loading correctly (19.0 & 19.1)

When photoshop loads it occasionally fails to load the default workspace, welcome screen or the file that was requested.

This occurs randomly without warning on boot.  Had this issue originally with 19.1, but after crashes with the pen tool reformatted my PC and installed 19.0 with the same problem.

Opening the workspace manually does bring up the panels, but photoshop is often unresponsive afterwards, so a close and restart is required.

No plugins are currently used, but I do use NexusFont for loading fonts into memory (which is never been a problem before - so doubt this is related)