can you attach your build.yml configuration to this thread?
does it works launching the production build from the RhoMobile menu in RhoStudio (or from the command line)?
What is the path of your vcbuild? you might be using the 64bit version. look for other vcbuild's on your system and try using the other version. Below is my path.
C:/Program Files (x86)/Microsoft Visual Studio 9.0/VC/vcpackages/vcbuild.exe
Yepp mine is the same.
Regarding when it crashes / does not matter, from Eclipseor from command line.
It seems like SDK path is not known. But when the application is build for run from Eclipse it works. But I had to reinstall WM SDK to get it work.