I have just upgraded to Leopard and had to reinstall PM 4.5.3.1
I am now getting feed back from my Windows using customers that they cannot use/see the images I have sent them. After going to their location, it seems that the photos are not showing up as attachments but I can see them inline in the email. I don't think it matters that I set "Mail" to send emails in plain text either.
OSX Leopard fresh install.