Hi,
yeah I am aware that I am not using any ARDK tools, but as I have noticed here (Proper way to get compass heading - #13 by rob_link) the underlying ARDK methods can interfere with the basic Unity Codebase (or so it may seem).
This might just be a c#/Unity problem, but maybe someone else from the community had a similar experience and/or is more proficient in c# and can help me out