If you update the header or footer the following query appears in the js. The reason is abvious :)
An error occurred. <br />Path: http://localhost/7.x/admin/structure/views/ajax/display/frontpage/default/header<br />Message: <br />Fatal error: Call to undefined function filter_resolve_format() in /var/www/d6/sites/v7-3.dev/modules/d7cx-views/plugins/views_plugin_display.inc on line 789<br /><br />Call Stack:<br /> 0.0001 62516 1. {main}() /var/www/7.x/index.php:0<br /> 0.1547 15433036 2. menu_execute_active_handler() /var/www/7.x/index.php:22<br /> 0.1624 16353768 3. call_user_func_array() /var/www/7.x/includes/menu.inc:454<br /> 0.1624 16354476 4. views_ui_ajax_form() /var/www/7.x/includes/menu.inc:0<br /> 0.5493 18872076 5. views_ui_regenerate_tabs() /var/www/d6/sites/v7-3.dev/modules/d7cx-views/includes/admin.inc:1605<br /> 0.5521 18901220 6. views_ui_display_tab() /var/www/d6/sites/v7-3.dev/modules/d7cx-views/includes/admin.inc:1318<br /> 0.5521 18901796 7. theme() /var/www/d6/sites/v7-3.dev/modules/d7cx-views/includes/admin.inc:1189<br /> 0.5526 18905768 8. template_preprocess_views_ui_edit_tab() /var/www/7.x/includes/theme.inc:819<br /> 0.5528 18908064 9. views_plugin_display->options_summary() /var/www/d6/sites/v7-3.dev/modules/d7cx-views/includes/admin.inc:1105<br /><br />
Fixed by commit 203