Q: In your screenshots, I see tabs like "Specification imports" or "Variables", but I can't see them in my own Eclipse!
A: You probably have to select the AlPiNA perspective. Clic on Window -> Open Perpective -> Other. If AlPiNA is correctly installed, an AlPiNA perspective should be found in the list that appears. Otherwise, try to update AlPiNA.
Q: When I write an ADT, or a Property, or a Clusters definition, I get a weird error message: "Couldn't resolve reference to xxx", with xxx being defined in an imported file
First of all, check that you imported the file correctly, and that the referenced object was correctly defined in its file. If everything is ok, try closing and opening both files, this should force XText to rebuild the linking and may correct your problem.