close / open widget doesn't work

Hi,

I’ve installed wp page widget v2.5 in wp 3.9.1 and it all worked fine. I upgraded to wp 3.9.2 and now I’ve the following problem. In edit page mode I can’t move widgets to the side bar anymore. Also the open / close option of all the widgets on this page (e.g. Publish, Page Attributes) doesn’t work anymore.

If I disable wp page widget all works fine (of course wp page widget doesn’t).

Regards,

Ronald

https://www.ads-software.com/plugins/wp-page-widget/