We have released version 0.8.1 of EMF-IncQuery, a release fixing a selection of bugs. It is recommended for all users of EMF-IncQuery to update to this latest version. The update is available both from Eclipse Marketplace and the project download page.
Furthermore, István Ráth from the project will be present at EclipseCon Europe 2014, and will be glad to answer any questions in person. If interested, he will be presenting about a new approach to use IncQuery in the MPS-based mbedder tool at the Modeling Symposium.