Are there any special VS parameters that need to be changed to get this linked correctly and working? There’s a Visual Studio project within the TUIO Client external (above) that I’m using to compile the external.
I would start by making sure that Max can find any DLL dependencies. The best place for these is in the "support" folder in your Max application folder.
When someone asks about the 14001 error it usually ends up indicating that the Microsoft C Runtime DLL cannot be found (and that the external object is compiled to link against it).
The MSVC DLL is installed by Microsoft’s dev tools, so it’s easy for an external developer to not notice the problem on their own machine. In the Max 5 SDK there are examples that link against an alternative "Max C Runtime". An alternative approach used by the Jamoma project is to link against a static version of the MSVC rather than the dynamically loaded version.