Can anyone think why, in Seattle, the path would be recognized as existing (turns black in the path dialog):

Can anyone think why, in Seattle, the path would be recognized as existing (turns black in the path dialog):

$(BDSCOMMONDIR)\Dcu\$(Platform)

Whereas this one would not (turns grey)

$(BDSCOMMONDIR)\Dcu\$(Platform)\$(CONFIG)

I am 100%, totally, completely, utterly sure that those paths exist.