I tested it now and it works fine, blocks posts and PMsMy Profile -> Modify Profile -> Friend/Ignore List and type the forum name there.
If the person changes/modifies their name, it doesn't seem to continue blocking anymore.
Direct link: http://epicpw.com/profile/?area=lists;sa=ignoreI will check it now. But I believe it works fine. Maybe you mistaked it with different forum account, not just name change.
No, I tried it more than once, the person had the same profile picture, posts, etc, just modified name.