In an exposed view with bulk style, when the form is submitted via Ajax, the form action set by VBO is incorrect. This is introduced by http://drupalcode.org/project/views_bulk_operations.git/commitdiff/23d19c4
Example: in a view with two displays: a default display and a page display, if you call
$view->get_path() it returns the path to the page display, not to the current display. Views uses this value as 'view_base_path', and VBO should not use it, instead, use 'view_path' (which is the value of
check_plain($_GET['q'])) as in the old version.