Technology drives me nuts sometimes.

I used to use Animation Shop, but recently I've only had ImageReady and since I don't do many animated icons I'm not really proficient with it. Now, I've learned pretty much everything I know about Photoshop and ImageReady from the memories of this comm, so it's not as though I haven't looked there for an answer. ;) Anyway, from what I can tell the arrow menu on the optimize window should have a bunch of options including one to optimize a GIF to a particular size. But currently mine only has two options, like this:



I know it hasn't always been like this, though, because I did it before - on the icon I'm using now, for example - and had no problems. But now either I'm looking in completely the wrong spot, or something has changed. Any ideas?