Gmail Freezing when Preview Pane enabled

Chrome Extension
Degraded Performance

Users who have the "Preview Pane" feature enabled in Gmail may experience issues when using the Keeping Toolbar. This includes a non responsive UI or Gmail freezing altogether. We've identified the cause of the issue - Gmail updated how the Preview Pane works - and we've pushed a fix to the toolbar. Please update your toolbar to 3.3.6 or disable the Preview Pane (Settings --> Advanced) if you are experiencing this issue.