There is not a strong magnetic “feel” to it. If you have got the right tracker feature [Null] will be shown in the Attribute Manager (Tag is selected), in the Tab Planar. There is a list, and in this list you should find the three Tracker Features [Nulls] that will determine the orientation of the Planar Tag. It is possible to select those manually. However, if placed, the Nulls should find an entry in this list.
If nothing happen, please check with the support, and make certain to have the latest R16 version in your case.
I have used the footage of this tutorial, in R16 and R18 to test it for you and to see if there was a change noticeable for me. Both versions works in this regard identical.
All the best