That was a typo.
Yours may be working differently than mine based on installation paths and registry settings.
You could duplicate what I did and see if there's different results.
Download the FILEMON program here
http://www.sysinternals.com/Files/FilemonNt.zipStart up MC and go into the audioscrobbler plugin screen.
Start the FILEMON program.
In the Include setting, type in audioscrobbler.ini
All boxes at the bottom should be checked except for "Log successes".
Click the apply button under the audioscrobbler control section.
At this point you should have some entries in file monitor.
Take note of the path.
Close MC.
Restart MC.
You should now have more entries in the file monitor.
On my system, the path shown now that it's reading, does not match the path that was showing before.
Copy (not move) your audioscrobbler.ini to the path showing here.
That's where it needs to be to work correctly.
If yours shows the same path both times, then I can't tell you where to go after that other than to keep pressing last.fm to work on an update to their plugin.