I tried to load blueJ 5 extensions on two different windows 10 machines. None worked. The only extension loaded is always the submitter extension form <BLUEJ-HOME>. The extensions I tried were the classpath-extension for BlueJ5 and the SimpleExtension, I compiled. On my first machine I tried all three possible directories where an extension could reside. None worked, no other extension than the submitter one is displayed in "Loaded Extension" --- **Issue metadata** - Issue type: Task - Priority: Medium