SPARQL CONSTRUCT queries are not getting their results displayed any more in the web browser.
Create a new repository (I used a memory store with persistence)
Add the triples in simple.ttl (attached) to it
Execute the query in uncle-select.rq (attached). You see the expected 4 results.
Execute the query in uncle-construct.rq (attached). You get what appears to be an empty graph. Using "View Page Source" shows an empty SPARQL Results XML page. Using the "Download" button with the Turtle format selected will give you a file matching uncle-construct.ttl (attached), containing the expected graph.