The user experienced issues with their key script not functioning in edit mode, which they considered a significant disadvantage. They noted that the shortcuts, such as 'ctrl+m' for '\longmapsto', worked in other applications but not in their current editor. After testing in different browsers, they found the problem persisted in Chrome. A machine restart eventually resolved the issue, leading to confusion about why it only affected Chrome. The discussion highlights potential browser-related glitches impacting user functionality.