Cannot resolve symbol <class name>


I'm using IntelliJ Idea Community Edition, version 9.0.3. My project has several programs, all organized as modules in the project. These projects have dependencies between them, and I've set up each module's dependencies accordingly. The problem is, I end up with classes highlighted in red that Idea things it can't resolve - if you hover over one, a popup will read "Cannot resolve symbol <...>". But everything compiles fine, and runs fine!

I'd love to figure this out - anybody have any ideas? Rebuilding doesn't help.

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