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Let C1 be a class and N number of line in C1.java where breakpoint could be setted. Go into DebuggerWindow/Breakpoints, add new breakpoint - invoke AddBreakpoint Window, set breakpoint on line N in class C1 (Breakpoint Type = Line). Close window by OK. Breakpoint appears in DebuggerW indow. Invoke AddBreakpoint Window again. Fill in the same parameters as before - breakpoint on line N in class C1. Close AddBreakpoint Window by Cancel. Our breakpoint disappers from list of breakpoints in DebuggerWindow (or in Explorer). But the breakpoint is still setted - try to debug C1 now. Debugger stops on the line N. The same situation occurs for another type of breakpoint (for example on Exception breakpoint). If the breakpoint is specified in AddBreakpoint Window two times according to the given description, the n the breakpoint disappears from the list, but remains still setted.
Verified in Build 2011.
Resolved for 3.4.x or earlier, no new info since then -> closing.