Graphics/texture error in two different telltale games

I have an odd error with the Strongbad game, played through Steam. Whenever I start up any of the episodes, there are huge graphics problems. It appears that the game is not finding the right textures for the objects on screen. All of the intro screens are gibberish, and then when the menu screen comes up, the characters' head shapes are right, but painted with random garbage textures. I can fix it by going to the options menu, deactivating full-screen, then activating it again; however, this was a challenge at first because none of the text on buttons or tabs were showing up on the options menu. This was all gibberish as well.

I just downloaded and tried the Back to the Future game, not through Steam, and it had a similar problem -- though not as bad.

What's going on? and Is there a fix?
This discussion has been closed.