Thanks for the report.

Can you confirm there is still an issue with the vMicro > Debugger > Monitor Free Memory Unchecked?

If there is still a problem, please upload a new log with the vMicro > Compiler > Show Build Properties Checked.

Thanks for the detail, and it looks to be the limitation within the current toolchain (logged on GitHub here).

This can be worked around by either disabling the Serial Debugger, or by forcing a later toolchain to be used.

To force in a later toolchain
1) Install the "STM32 Cores" Board package from Boards manager
2) Add a Local board.txt file to your project, by Right Clicking the Project in Solution Explorer > Add > Local Board.txt
3) Add the below property to a Local board.txt file, then save, and build the project again

}