thanks for your feedback. This is a bug, which has already been fixed.
I assume you are using Modelur 0.4.5 from Extension Warehouse?
Please download Modelur 0.4.5 from our website
, we've just updated it a few days ago. Soon we will also update the version on Extension Warehouse, but we are still fixing some small bugs for the upcoming SketchUp 2016... and we do not want to burden SketchUp team all the time with small fixes. :-)
Hope that helps,