I have the same problem, Nav 4.76 doesn't like the anchors, IE 5 and Nav 6.1 do. W3C (3.2) validator says the generated source is ok. I saved the generated source to a static .html file, 4.76 still doesn't like it. I have one statically generated anchor at the top of the page, which works under 4.76. The dynamically generated anchors are inside a table (within <td> tags), perhaps 4.76 just doesn't like anchors inside of tables?