I’d also like to express my appreciation for the great support you offer, and to say that this is one of the best WordPress themes that I have come across. Cheers!
I am also having this problem. If anything but plain text begins a page/post (or text is centred or an image begins the page/post), part of the first line appears at the top of the blog, above the header.
I just uploaded the theme so I only have 1.8. I hope this issue will be fixed soon.