Hello
First problem seems to be related to a url rewriting issue
What is the landing url you get?
Can you try disabling SEF (just for testing purpose)?
For you second question. there is no reason it would behave differently between admin or registered users.
You can set the plugin position, but then users can manually change it.
- Need help? Post the URL of the related page (eventualy as confidential info), it will help solve your issue faster.
- An error, notice or warning? report the exact message including the line number
- If you get a white page , enable error reporting and / or check your server error logs.