Hi,
In GPUPerfStudio when i try to view the VAO configuration of a DrawCall where a vertex attrib is specified with a size of GL_BGRA there is an error and i cannot see any vertex data (The error is in french and say: "Reason: index is out of bounds"). But if i change the size to 4 instead of GL_BGRA everything is correctly displayed, so i suppose you don't correctly manage GL_BGRA in the GPUPerfStudio interface
cheers,
fx