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Open Java source in Editor. Press Insert button, cursor changes, but characters are inserted instead of overwritten. Press Insert again to turn insertion off and close editor by window system close button. Open editor again, press Insert to turn insertion on. Now insert works, characters are replaced. click window close button to close editor. Message box asking to save modified file is opened. But GUI freezes. Repeatable. GUI freeze disappers in build 309.
Priority is changed to P4 (normal).
Resolved for 3.4.x or earlier, no new info since then -> closing.