"Preview changes" in weaver, twenty ten bug

I was doing some changes into a certain page and suddenly the “preview changes” became inactive. Meaning that if I pressed “Preview changes” a new window used to be opened and I could see the work I done directly in that without updating the content.

Suddenly when I pressed “Preview changes”, no more new windows, only the current window opened, I could see the changes, but I did not have the option to go back in the dashboard to work further from the point I left, just by closing the “preview changes” window.

The only option I have, is to press “edit” from the page and go back into the dashboard to start from scratch again.

I tried to explain the best I could. If it is not enough please ask further questions.

Perhaps there is a way to get back to “preview changes” button.

Thank you very much in advance.