Ad inserting doesn't work anymore

I tried like always to insert a single Ad by using the button in the editor.

The window pops up, i choose the Ad and click on insert, but nothing happens….the window remains open but nothing happens. Nothing in the error-log.

When comparing i suddenly noticed, that all my other pages are having the same problem – so i guess it can only be related to the new version of wordpress 3.9.2. – that’s the only thing that changed.

https://ww.wp.xz.cn/plugins/simple-ads-manager/