Hi Steve,
Sorry, the project has been encrypted because its copyright belongs to my company. But I can send you the .vcxproj file.
In the one which fails to resolve symbols I have 4 configurations in the project: Release Win7 2.3, Release XP 2.3, Debug Win7 2.3, Debug Win7 2.3 ( no Release and Debug ). Another one that only has Release and Debug configurations works fine. Both this two projects are setting by Nuget and the .vcxproj file are sent to your e-mail. Thanks a lot for your reply.