should all be working fine, can you show some code?
the only obvious issues i can think of are;
- positioning, make sure they are actually near or infront of the player (easiest way is to position it at the hmd position then use moveobjectlocalx/y/z), if you are inside the object it won't render
- the camera draw range, make sure you are setting the near and far ranges to a good level and it's not cropping the object from being rendered
- scale, the object might be too small as vr has it's own scale - though you say you already tried it
if you still cant get it to work then just copy the code from the example demos and see what youre doing differently.
life's one big game
spec= 4ghz, 16gb ram, AMD R9 2700 gpu