That's it! Thanks very much. I actually also had a box in my examples...but apparently the reflection was too low and distance too short to have the effect clearly visible.
For anyone interested: There is a difference in using thin (no refraction) or not. Thin gives offset reflections when apply to a sheet of glass (box). If turned off, you need to increase IOR of refraction to have offset reflection. But in most cases thin is used anyway!
Thanks ficdogg for clearing that up!
