This is a strange issue and not a common problem with Sitefinity. If it is not too much trouble could you give us access to your backend so we could login there and see for ourselves what exactly is going on?
For a remote assistance please check the following URL - http://www.sitefinity.com/devnet/support/express-remote-assistance.aspx
I would need access directly to your backend - possible with an administrative credentials, so I could verify the cause of this problem.
Could you please review the link that I sent you - you need to buy credits and then you can schedule a time for the meeting? Please let us know when you are ready to proceed with the meeting.
We can take a look at the issue, although if you want a remote desktop session then you have to agree to the conditions mentioned in this link. You actually need to buy a minimum of 2 hours of remote session so the price would be 2 x $399.
A page becomes locked when some user - e.g. an Editor opens the page for edit and closes the browser without saving the changes. A Temp version of the page is created and the page actually becomes "locked" when there is a Temp version. An Administrator however can unlock the page.