Yay, we are running into problems with ambiguity of byte, which is defined in C++17, but apparently it collides with some declaration in Visual Studio headers 😬 . Maybe we can fix it by just moving using namespace std in vsdata.cpp🤔 .

Nope, it comes from somewhere else due to the namespace pollution 🫤 . I have cleaned that up in #336 , so I transplanted that here. Let us see if it works...

Thanks so much @najlkin for looking into this

It works! 🎉

@tzanio , we need to merge this asap as GLVis cannot be compiled with MFEM 4.9/master with CMake without it and all CMake CI jobs are failing due to that 😱 (like here).