Hi, Tan. I got your reply email. I can see that the groups are working as they should. I am still not having any success with tabs. I used the Test Meta Box set you created. If I try and next a meta box inside a tab, the meta box disappears and I have to refresh the page without saving or that meta box will be lost. If I don't next the meta boxes and just have them below the tab items, nothing new appears on the post edit screen - no tabs are shown.
