View Proofing Copy & Change Story Format

Hello,

I'm new to Twine and have Version 2.0.6

I've tried to search for my problems, but couldn't find anything, so I apologize if I missed it.

First Issue:

I clicked on View Proofing Copy and get a new window that opens, but it's completely blank. The window bar at the top left says "node-webkit" but there's absolutely nothing in the window itself.

Second Issue:

When I click on Change Story Format, I get a white popup that says:

Story Format
A story format controls the appearance and behavior of your story during play

BUT....

Over top of that are FOUR thin red ones that say:

The story format “Harlowe” could not be loaded (Could not load story format source).
The story format “Snowman” could not be loaded (Could not load story format source).
The story format “Paperthin” could not be loaded (Could not load story format source).
The story format “SugarCube” could not be loaded (Could not load story format source).