The tabs and accordions are jquery UI widgets, so it sounds like it is failing to load the jquery javascript and/or the jQueryUI css.
Make sure you used the new Web.config instead of keeping your old one. Make sure the layout.master file of your skins has:
<%-- JQueryUIThemeName valid options are:
base, black-tie, blitzer, cupertino, dark-hive, dot-luv, eggplant, excite-bike, flick, hot-sneaks,
humanity, le-frog, mint-choc, overcast, pepper-grinder,
redmond, smoothness, south-street, start, sunny, swanky-purse, trontastic, ui-darkness, ui-lightness, vader
--%>
<portal:StyleSheetCombiner id="StyleSheetCombiner" runat="server" JQueryUIThemeName="dot-luv" UseIconsForAdminLinks="false" />
and make sure it also has
<portal:ScriptLoader id="ScriptLoader1" runat="server" />
unless you copied all the skins from /Data/skins into /Data/Sites/1/skins then you really are not using the latest skins.
If you are on a private network then you may need to host the jquery files locally.
Hope that helps,
Joe