hi!
i use version 1.33 with the #megazine style with fixed width and height, so no liquid scaling. when i now use the centercovers=true i get a 1px grey line next to the centered pages (on the left). when i use the normal relative size tags for #megazine, i get the problem too, and when i then resize the browser window the grey line sometimes jumps to the top of the page. this happens with safari, ff2, ff3, ie6, ie7, chrome on a mac system and on a windows system. the line is always grey, wether i change the wmode: "transparent" or set the bgcolor of the flash file or the bg of the html site. when i turn centercovers off it is gone. of course the line is only visible if u change the standard grey background, so maybe thats why nobody found it till now. if u have trouble reproducing it i can upload it.
cheers