Short answer: 1.29 has added/changed some things, such as the Video icon. You will need to find the bookmarks for the 'bits' that need fixing.
There is a new version of H3mod coming (or is it out yet? I haven't checked) that will have the new bookmarks included. If you're not comfortable modding the skin yourself, you'll have to find someone who will do it for you. Maybe you can sweet talk the skin author to update it.
EDIT: OK, I checked, and the new H3mod 2.2 is out, with advice on updating old skins. Check
this link.