Is the featureDefinition file being copied by your post build event?
What is the name and location of your feature definition file?
The setup page will only show and configure features for which it finds the feature definition file.
Your post build event should copy it from
yourproject/Setup/applications/[yourfeaturefolder]/FeatureDefinitions
to Web/Setup/applications/[yourfeaturefolder]/FeatureDefinitions
The name it shows on the setup page will be determined by these settings in your feature definition file:
resourceFile="FormWizardResources"
featureNameReasourceKey="FormWizardFeatureName"
above is the values from Form Wizard Pro
You may need to compare the xml syntax and elements in other feature definitions files that work to yours and make sure you don't have any mistakes.
Hope that helps,
Joe