Hi again Steve
I went through murder getting pics to post (witness my LONG despairing thread!!).
One thing to check with Yahoo is that you've made your picture folder "public". Also, what resolution are the pics? Yahoo say they don't make "Hi-res" pics public - but helpfully don't explain what they count as hi-res! The other thing is to make sure you're copying the address from the full-size pic, not the thumbnail. (Sorry if I telling you how to suck eggs!)
I haven't tried Yahoo since I got an MSN folder running, but I'll try now:
Here's hoping...
Rowan