I had the same problem.
I have an autoit script that launches mc17 using the command Run ("MC17.exe /mcc 22001,3", "")
However, for reasons I don't exactly recall, the script is launching a different copy of mc17.exe than the one in c:\windows\system32.
I copied over the one from c:\windows\system32 and it worked fine.
So I suspect the problems is that like me, you are running an older version of mc17.exe. Launch the one from c:\windows\system32 and that might fix it.