After upgrading to v4.1.4 (from 3.2.1) I noticed that shortly before a ajax highslide is displayed, a small area of the browser viewport is visible for a very short amount of time. This irritating and undesired effect is also reproducible on the examples at the highslide.com startpage.
This only happens in Firefox on Linux, not in Firefox on Windows. In v3.2.1 no flickering occured.
Thanks,
Martin