Scriprting Define Blocks in Visual Studio are the opposite of what they should be

Questions & Answers
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1

For some reason yesterday my current project went from working fine in Unity and Visual Studio to suddenly - the code that is inside a correctly defined code block is grayed out - but still active in Unity. In other words, if there is a syntax error in the grayed-out block, I get an error message in Unity, but cannot see the error message in visual studio.

Example:

#if SYMBOL_DEFINED_HARDWARE_CODE
bool isThisHardwareAvailable;
bool canHardwareBeActivated       // <-----missing semicolon
bool isFinished;

void DoSomething()
{
     DidThat = isFinished;
}
#endif

In the above code even though I am working on a project that is correctly defining the hardware - the color of the code is gray and therefore not being analyzed by the intellesense etc. In Unity I do get the error message for the missing punctuation.