So occasionally I have this problem (and it's only happened a few times) where all the imports and all the methods and all the variables, etc. in a file are highlighted as unused. They grey out and I get yellow bars all the way down the gutter. The only way I can fix it is to make some trivial change that introduces an actual error (like delete the 'p' from 'package') and then put it back. After it rescans the file, everything is fine again.
Anybody else ever see this?