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In Chapter 3|Debugging Java Classes|Breakpoints you can find the following sentence: The current line will be highlighted blue to indicate that the breakpoint has been set. But the line will be red instead of blue. The figures of the debugger window should be updated, too.
Resolved by a new version of User's Guide (Build 1100).
Resolved for 3.4.x or earlier, no new info since then -> closing.