SPARQL Query tab in Protege doesn't show anything
It happens in version 2.0.1 of Protégé SPARQL Plugin, bundled with Protege 5.2, after any ontology is loaded.
Update the the "OWLAPI RDF Library" and "Protege SPARQL Plugin" to the latest version with the auto-update mechanism (which appears when starting up Protege or can be activated through the
File > Check for plugins…menu):
Source: https://github.com/protegeproject/sparql-query-plugin/issues/10.
For Protege 5.5.0, you may also need to add query view from menu:
Window--> View-> Query View-> SPARQL Query
And drop it into the SPARQL Query tab.