I have created a simple object. I am following the directions precisely in both the book and the website on how to reflect the object, A parrallelogram:
1) Select the object with the selection tool
2) Choose the reflect tool
3) Go to the reflect dialog box, choose, Object > Transform > Reflect
4) Choose the access across which the object should reflect, (in this case, horizontal)
5) Click OK (or preview just to preview the reflection
Any clues on why this isn't working?
You may skip the Reflect Tool and just use Object>Transform>Reflect.
In any case, it should work, so your preferences may be corrupted.
After closing Illy, you may Ctrl/Cmd+Alt/Option+Delete (irreversible destruction of preferences), or follow the instructions here under the heading Move the folder here: http://www.bugge.com/Family-and-friends/Illy/illy.html, (reversible).