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Debug vs Release mode - Cannot open include file: 'stdafx.h'

I have a fairly complex application which compiles fine in Debug mode (in Visual Studio .NET) but when I switch to Release mode I get the error:
fatal error C1083: Cannot open include file: 'stdafx.h': No such file or directory

The #include "stdafx.h" that this error refers to is from a file that was developed outside my project (ie. I added the .cpp and .h file, but not its corresponding stdafx.h - because I have my own.)

I don't understand why it would compile in Debug but not in Release.

jkr

Under your project settings, check whether your Debug and Release configurations are different in "Additional Include Directories" and make sure that these entries are the same (if applicable).

joannabanana

ASKER

Yup I checked that, they're exactly the same :(

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jkr

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Anthony2000

Is it possible that someone disabled "Precompiled headers" in debug mode?, but not in "Release" mode?

joannabanana

ASKER

All the settings for the project seem to be the same for Debug and Release.

I have now noticed, however, that I only get the error if I try to "Build" the solution but if I click "Start" (debugging), it asks me if I want to build the solution (as it is not up to date), I click Yes, and it builds and runs ok.
Can anyone explain to me why this is so? I am fairly new to this and am getting a serious "crash course" (literally! lol).
Thanks