All modules compiled every time. Actionscript/Flex

I manage a project with about 10 modules. It seems like IntelliJ compiles all modules every time I start up the debugger. As far as the manual goes, this is not supposed to happen.
"IntelliJ IDEA keeps track of the modules where nothing has changed since the previous compilation"
https://www.jetbrains.com/idea/help/compiler-actionscript-&-flex-compiler.html

I tried seeting up two more or less identical sample modules, A and B. Module A references the build configuration of the 10 other modules. B references the built libraries (swc's) of the 10 other modules.

Approximate compile times are:
A: 15-25 seconds (always)
B: 1-2 seconds

I'll appreciate a little help to get my compile time back on track.

Version: IntelliJ 14.0, november 4 2014