Having some strange issues with Puzzle Agent 2 on a Mac, purchased through Steam. For the "Find Edvard!" puzzle, the background image for the puzzle appears not to render properly. It's clearly visible in the hints, but doesn't appear in the puzzle, as shown on the attachment. Without knowing where Edvard is, it'd be hard to route Tethers to him.
Having a similar problem with the Power Grid problem -- all I see is a bunch of yellow dots on a black background.
Running 10.6.8 on an older MacBook; played Puzzle Agent without trouble on the same system, and all the other puzzles seem to be fine. Help?