As in, the program wouldn't display the graphic when it was named "retro-water.png", but name it anything else -- "retro-water2.png", "retro-test.png", whatever, and it works just fine.
WTF? I mean, seriously, WTF?!?
Computers are teh sukc sometimes.
I renamed it "retro-water-gremlin.png". It works now.