[ohlala]

Mhm, maybe I was too fast with my comment that your suggestion helped :-( After several days it appeared again. However, at least I could figure out when the problem appears! Well, it seems to appear after I opened a window, in which a flash movie was playing, but only if a new window opened
, which was not showing the icon bar and the bookmarks. After restarting Omniweb in most cases all windows now appear without icon bar. If the movie was embedded in a "normal" window everything is fine. The weird thing is that I observe a similar behavior sometimes with Safari!! In general I see it more often on my macbook pro running under Snow Leopard.