We get a lot of Support Tickets with only this as the description of the problem.  We usually go through these steps before trying to figure out if something else is going wrong...

1. Confirm that you have the JUGA System Plugin/Mambot published.  JUGA's restrictions don't work without it.
2. Confirm that you're testing your front-end as a normal "Registered" user -- your Super Admin will *always* have access to *everything*
3. Search JUGA>>Site Items for the term "Content Component".  Is this item included in JUGA's restrictions?  If you have it excluded, then *all* of your content items will be outside of JUGA's restrictions.
4. In JUGA>>Variables, filter by "Front-End" and "com_content".  Then set "Add New" to "Yes" for the "id" variable.  This will tell JUGA to automatically create new Site Items that vary from existing ones by the "id" number.  Then browse around your front-end and see how JUGA creates the appropriate Site Items for restriction.  Assign them to JUGA Groups as you desire.