Symptoms

Reproducible with the latest stable versions of IE, FF, Safari, and Chrome browsers, the browser hangs (CPU usage also noticeably increases) when the "Next Element" button at the top of a review is clicked or the keyboard shortcut '.' is used. This has been observed only with reviews that have a single file attached. After some time the "slow script" dialog is displayed (see attachment below).

Cause

This issue is a known bug:

CRUC-5781 - Getting issue details... STATUS

Resolution

Attaching a dummy file (an empty file) to the review will prevent the browser from hanging.