If you have installed 64bit version of WAMPServer, you guys might have noticed that my.ini configuration changes are not reflecting in MySQL server.
Actually there is a tiny bug that got through testing on the 64bit version of WAMPServer.
In the 64bit version of WAMPServer the name of the MySQL service was changed to wampmysqld64 but they forgot to change the section name in the my.ini file accordingly.
So in my.ini change the section name to
# The MySQL server
The way MySQL works is to look at its own service name and then look in the my.ini for configuration setting under a section heading that matches its service name.
This should make MySQL pay attention to your config changes.