Thread:Support/Preview-Button not working

When entering a comment on a message from the JavaScripts message editor pane via the button at the lower edge, we get a new browser tab or window showing the support page with an edit field group with some presets and three buttons: This is probably a report to be made on bugzilla?
 * Save - works as expected
 * Preview - does nothing
 * Differences - moves screen contents up and down, otherwise doing nothng