The compilers now checksum the source code when compiling, and record this in the debug information. The debugger uses this checksum to verify that the source file exactly matches the source file at the time of compilation. If it doesn't match, then the breakpoint will not bind.
To fix this, either open the source file that really does match the one at the time of compilation, or disable the checksum. You can disable it on individual breakpoints by right-clicking on the breakpoint in the Breakpoint Window and selecting Location and check Allow the source code to be different from the original version. You can disable it on a global basis via Tools/Options/Debugging/General and uncheck Only use source that exactly matches the original.
Click here to start the breakpoint helper again.
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