I am trying to get the LanguageTool 2.0 extension to work under LibreOffice 4.0 under Linux, but with no success so far. When I start LanguageTool, all I get is the standard LO spell and gramma checker. It totally ignores any (deliberate) errors in the document. The same problem occurs on several machines, and I installed the Oracle JDK on all of them, plus I made sure the extension is enabled.
What could be going wrong?