System: Linux OS.
Java Version: all.
by default (install)... if we try to open Library Java Class (Help menu) the IDE get frozen.
Checked out also to change it to local API Doc. also the IDE get frozen.
Also happens when trying to Generate Documentation about classes or open Tutorial Bluej,
Open Site BlueJ, etc.. any menu or option that from the IDE Menu try to open the browser provoke the IDE gets freezing.