Appcode cannot find associated header file (takes ages)

Hi!

Sometimes it happens, that when I press Command+Ctrl Arrow Up to switch for a .cpp's header file or back from a .h file. Appcode goes into `Looking for Associated Files` . Even though the header file is just called as the .cpp file and they share the same folder. They are also both part of the (rather large) project. This takes ages and happens out of no apparent reason.

Does anybody have a solution for this?

Thanks

Konrad