Hi, I'm using lyx 1.2.0 on mac OS X, with html export set to use tth. I have a document with a embedded PNG graphic (via insert->graphics), where the PNG file is present in the same directory as the lyx file. When exporting to html, the reference to the image is given to a temporary image file, i.e. img src="/tmp/lyx_tmpdir***/lyx_tmpbuf2/image.png", rather than the actual file: img src="image.png". This, of course, breaks the exported html page.
Sorry if this is a known bug and has been reported already. yan