Open the Breakpoints Window and check the glyph next to the problem breakpoint. Is it solid red, or some other icon? If the glyph is a hollow red circle with nothing else overlaid on it, then the breakpoint is disabled: you'll need to enable it to get the debugger to stop there.
Make sure you try this in Debug Mode and not Design Mode. You can tell you are in Debug Mode by the main window title which will show [break] or [run].
Click here to start the breakpoint helper again.
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This is a prototype, please send general feedback