Chaning headers in Xcode 1.5 does not force recompile

I have a problem with Xcode not recompiling source files when one of its headers that it includes gets changed. I have had this problem before but I have never been able to fix it. I looked over at IDevGames and people have had the same problem but never got it fixed. It gets quite annoying when you figure out the bug you have been trying to fix for the last hour was a problem compiling. It is easy to fix if you edit one file and then you notice if it isn't compiling, but when you are working on multiple files you don't notice as much. The only fix I can find is to edit the source file that includes the file, but that does not always work so I have to do a clean build which takes up a lot of time. I have Predictive Compiling turned off so this is not the problem. Does anyone know how I can fix this?
Thanks,
vbuser

No this is not a system header. It is a custom header that is included in the project. It normally works correctly recompiling when I change a header, but sometimes something happens to the project and all of a sudden it will not recompile when I change the header that I am including in my source files. I have tried creating a new project when this happened before but the problem seemed to come back quickly.

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Chaning headers in Xcode 1.5 does not force recompile

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