I am having a problem with effects in Illustrator CS4.
I applied a warp effect to a path. Normally, when I want to modify the warp effect, I go to my Appearance panel and click on the Warp: Arc link. See screen grab on the left.
But I just opened an image I was working on earlier and noticed that the Warp: Arc link has vanished. See screen grab on the right.
I am pretty sure I didn't accidentally expand the path, because when I select it I can see that it is still a straight line but with a warped appearance. There also seems to be what looks like an arc icon at the top of the panel, above the eyeballs. I never normally pay attention to what's going on with this icon, but I am guessing it means that the path has an arc effect applied to it.
Is there anything I can do to 'reinstate' the effect that I assume is still there somewhere?
Thanks for reading. I tried searching for a solution, but I mustn't be using the correct terminology because I couldn't find anything relevant.