After choosing a version to revert to (in the History page)
I get a page asking me to confirm the revert operation.
Clicking the confirm button does not revert to the selected version
and display the page again.

Changing revert.php line 36 from:

if($confirmed) { 

To:

if($confirmed or $_POST['confirm']) { 

Solved this issue.

I am using version 2010042201