(To be fixed in master, for 4.1).
When phpMyAdmin thinks that there are no rows in a table, some tabs (I noticed Browse and Search) are greyed out. However they can still be clicked, because by the time the page has been displayed, another process might have written some rows to this table.
But clickable greyed out tabs is confusing for some users. So, for 4.1, these tabs should not longer be greyed out.