I have created a set of VRT's for base mapping vector tile layers following this tutorial
This works well for displaying the layers but If I want to export or copy out a subset of the features the resulting set of feature is different to what I had selected. When I draw a selection area the selected features don't correspond to the area I have drawn, features 2KM away seem to get selected randomly.
If I do Project> export dxf I get the right features/ area I wanted. There is not an option to create a spatial index.
Maybe vectors in VRT just isn't properly supported.
QGIS 2.10.1 OSX 10.11.1