When I start avidemix_cli.exe without any arguments, I get a messagebox (yes, on the CLI version, I didn't expect it either) saying this:
avidemix_cli.exe - Entry Point Not Found
The procedure entry point __gxx_personality_sj0 could not be located in the dynamic link library libstdc++-6.dll.
[OK]
Three times, every time. I'll attach the program output.
Using 2.6.4 r8882 x64 on Windows 7 x64 SP1.