Widget Logic Visual Version lets you control on which pages widgets appear using WP's conditional tags without having to know how conditional tag
Try switching to the WP default theme
If that doesn't work try deactivacting all your plugins.
If either of those issues makes the plugin work fine - then activate your plugins one by one until you find the one that is the conflict (or the theme).
Here's a video tutorial:
Post plugins questions and comments in the forum: Widget Logic Visual Forum