Thanks Rod, for continuing to look into this. Your last suggestion solved the problem – installing both the x64 and x86 versions of the 2012 C++ redistributable packages. On our Windows 10 machine, SteamVR had installed the 2005, 2010 and 2013 versions of the Visual C++ redistributables (both x64 and x86), but not 2012. I thought it must be a Windows 10 related issue, because the Unity 5 errors didn’t come up on our Windows 7 box. On Windows 7, SteamVR only installed the 2010 and 2013 redistributables, but this issue never came up. Works out of the box on my MacBook Pro as well, but I sort of expected that.
RealSpace3D paired with the HTC Vive is awesome by the way. We’re going to be demoing at the TechCrunch Disrupt VR Pavilion in 2 weeks and our demo machine is the Windows 10 one, so this fix sort of saved the day. Thanks again. -Alex