I am new to eclipse. In the C/C++ perspective I can toggle breakpoints by double-clicking the breakpoint column in the editor. As soon as I launch the debugger, I lose the ability to manipulate the breakpoints from the file view (I can enable/disable existing breakpoints in the Breakpoint view). After terminating the debug session and switching back to C/C++ perspective, I am still unable to toggle breakpoints in the file view. If I then close the opened file and reopen it, I can again toggle breakpoints. If I am in the Debug perspective and the debugger is connected, reloading the file does not re-allow breakpoint control.
I seemed to have fixed my problem, but I have no idea if this is correct.
I changed the default file associations for all the file types that could have breakpoints from "Syntax Coloring Editor" to either "Assembly Editor" (*.asm, ...) or "C/C++ Editor" (*.c, *.h, ...).
If you are having problems with breakpoints, then you might want to try the debugger shell.
Do a "help bp" in the window for command syntax.