There is definitely something a bit odd about the conversation tool. I don't see the reply I sent you a few minutes ago. I think the private messaging works better as long as you remember to empty your mail box every now and then!
I realised when I got a message by email telling me you had tried to send a message. I have now cleared it out and have sent you a message. I sent the 'much better' comment when you were cropping your avatar but you didn't spot it at the time. I think there is often a delay in the messaging on the site. Now, what I need is a picture for my avatar too