These are drop targets for the layout you have selected drop editor panel into them, or choose layout from the screen options menu...
The extra columns are not appearing, or the layout is not as the icon suggests..
Other installed plugins may alter the output before its had chance to locate them, in.
Try dragging the panel to the top of the column, or over the last panel in that column.
Prior to WP 3.9 the wysiwyg buttons did not wrap to the next line, and will be cut-off on narrower displays.
The option has not changed, just reload the page after you've arranged the panels and it will display correctly...
If you have another plugin that modifies the menu size or other margins then the panels may overlap, as the stylesheet is configured to work at default sizes...
You will need to re-adjust the panels again if you re-activate the plugin...
The extra columns have stopped working and I am missing the editor panels that were in them..
Browse the code, check out SVN repository, or subscribe to the development log by RSS...
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