PHP-Exec distroys the jQuery functionality in the Backend.
Whyever if I disable the plugin, everything runs fine. If I enable the plugin, the jQuery functionality is gone.
As example click by the comments on "answer". Nothing happen if plugin is enabled, if plugin is disabled, it works.
Have the problem on more than 30 WP installations, all with WordPress 3.4. All other plugins disabled for the test. If you want to test it, send me a mail to stefan wuk ch and I will send you an acc for one site.