Not so difficult really, I 've got it set up that email; Yahoo, ICQ, MSN are not shown. I haven't got time now but I'll try and post it tomorrow (if you're still interested).
It involves changes in profile, topic, memberlist, groups en private messages.
Basically (if you're willing to try yourself) just look in the phpfile (e.g. viewforum.php and replace $yahoo_icon = something; by $yahoo_icon =' '; (variable name is not correct I think). Similar for msn icon, etc..
Alternitavely (and maybe easier) is just to remove the icons from the template.
My board's not broken, it just went peculiar