Which installation method did you follow?
- QuickStart ?
- One-by One?
If you did the One-by one method. You should define some modules to module positions.
If you did the "QuickStart" method and you still have this problem, then there must be a server problem. Are you working in a live server? Please provide me your joomla admin account and let me check the backend parameters.
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Regards.
Support & Development