I haven't been able to add custom emoticons either for quite a while now. I've tried reinsatlling MSN Messenger from
http://messenger.msn.com which seemed to solve the problem for some people.
There was also another suggestion from
Add Emoticons not working [7.0.0813]
quote:
Originally posted by Sunshine
There are people who change location in .NET passport to UK and "add" is back in rightclickmenu again, so you could try that.