Infinite loop while displaying gallery ( admin ) in 1.9.27

Version 1.9.27. In back end when you go to Galleries -> Galleries and select a gallery, program goes into an infinite loop re-reading the page. Reverting to version 1.9.26 fixes this problem.

Correction: this happens with WP Smush 2.1.1 installed and active. There is a conflict with these two plugins installed. Without WP Smush active 1.9.27 works ok.

https://wordpress.org/plugins/nextcellent-gallery-nextgen-legacy/