[id0001]

I was trying to update the StartPosition and Endposition of a LineWithTextVisual3D and noticed that both the line and text get copied every update. 
I then took a look at the source code with DotPeek to see what was happening and saw that 2 visuals are added to the Children collection every time CreateModel is called, but this collection is never cleared except when UseTextBlockVisual3D is False.

[abenedik]

I can confirm that this is a bug that was introduced in the previous version of Ab3d.PowerToys when the UseTextBlockVisual3D property was added to the LineWithTextVisual3D.

The fix for this bug will be available with a new version that will be released this week.