Paul wrote another plug-in that does this and it works fine for me but you'll need to read this post from Paul before you download it :
http://www.gossamer-threads.com/...i?post=217146#217146
Link to plug-in to block forum messages (from specific users):
http://www.gossamer-threads.com/...i?post=214321#214321
Significant Media
http://www.gossamer-threads.com/...i?post=217146#217146
Link to plug-in to block forum messages (from specific users):
http://www.gossamer-threads.com/...i?post=214321#214321
Significant Media