Cruz Micro Reader - Screen colors are reversed, how to fix?

[swd]

Hello! My Cruz micro e-reader display is showing the colors reversed like a photo negative, so it's difficult to read/navigate. No, it's not set on "Night Mode" - I checked! -- and it's not just happening in the book section, it's across the board. Makes it very hard to see. Any ideas on how to fix/switch back? Is this a setting I turned on by accident or is it broken? Thanks!