Hi,
The GDB binary is typically supplied with your toolchain and depends on your project type. Generally, we were not able to get gdb to work reliably with spaces in paths during our tests and hence recommend using paths without spaces. You can try working around this via the Path Mappings page of VisualGDB Project Properties (see the “All Commands” view of the GDB Session window to see the exact commands sent by VisualGDB), setting the “Use file names only” checkbox on the Advanced GDB Settings page, or by running the breakpoint commands with different path syntax directly via the GDB Session window.
If you manage to find a specific breakpoint command that works with your paths, feel free to post it here and we will help you configure VisualGDB to issue this command.