Compiling header file changes with VC

I am having some problems getting the V12 Engine project to recompile properly when making changes to a header file. For example, I added a member variable to the shapeBase class and used it in the implementation. I recompiled the project and got an exception when I tried to load a mission. If I do a clean rebuild of the entire project (10 minutes+), the problem goes away.

I've also seen other strange problems with editing header files as far as dependancy goes. If I change a header file that other implementation files depend on - those other implementation files dont automatically rebuild - as they should. Again, a fresh build of the V12 Engine project fixes the problem everytime.

When I use the debugger to try an diagnose the issues, it always ends up being that the compiled code is unaware of the changes I have made to the header files.

I am guessing that this is a VC setup issue (I seem to remember facing this in other projects). I was going to start digging in to figure out what's wrong but I figured I check the forums to see if anyone else has stumbled on this problem and subsequently fixed it.