Edit Mode URL mess up
PermalinkI got the following: I sign in to my site and edit bar is there. I navigate to the page I want to edit using top nav.
The URL for that page is shown as: mydomain.com/page
Edit bar has disappeared. I go back home, edit bar has disappeared.
Site acts as if I have logged out.
To reach a page in edit mode I have to go through the sitemap in dashboard. Then the page URL shows as mydomain.com/index.php?cID=155
If I tick the box: Stay logged in on site the edit bar also disappears, but this time there's an empty space where the edit bar should be and the footer showes I am logged in.
I never had this problem before, it started on a live site, just recently.
It happens in any browser.
I am using Treviso Theme
Can anyone help me with this?

Are you still having an issue?
What has been changed to upset the site?
Is there something I can do about this in the htaccess file maybe?