Support the masquerade module

I don't understand what you mean by 'can't go back', nor what that has to do with this module.

I whitelisted the path, which is now part of 7.x-2.x-dev. It will become part of the next full release, but I don't have any plans to release a new version until there are more features to be added as part of the module. So I'm adding a patch that contains the changes, you can apply the patch now, and next time the module is upgraded you won't need the patch anymore.

Unmasquerade path is also whitelisted in 8.x-1.0-beta2.

Your issue must lie with some other module - I only whitelisted that path, I didn't alter the user object at all, nor do any redirects or anything. I simply the conditional that determines whether it should be checked if a redirect should occur. I changed this:

if($user->uid && !$ajax_request && !in_array(current_path(), array($change_password_url, 'user/logout', drupal_get_path_alias('user/logout'), 'user/password', drupal_get_path_alias('user/password'))))
{
  // Test to see if a redirect to the user edit page should occur

To this:

if($user->uid && !$ajax_request && !in_array(current_path(), array($change_password_url, 'user/logout', drupal_get_path_alias('user/logout'), 'user/password', drupal_get_path_alias('user/password'), 'masquerade/unswitch')))
{
  // Test to see if a redirect to the user edit page should occur

As you can see, I simply added the path 'masquerade/unswitch' to the paths at which the module checks on whether a redirect to the user edit page should occur. I also went through and did a double check to see if the module is altering the user object anywhere, which can cause a logout, and there is nothing. And finally I tested it on my local installation, and was able to switch back without issue.

So I believe your issue lies with another module.