Any response by us depends on answers to questions I have asked and I gave an outline above on various scenerio's dependent upon your answers.
Now based on the questions I asked but did not get a response from as pistebasher even pointed out to you I did a little research into our licenses and from my investigation your running this gallery correct?
http://gallery.shwing.com/
That gallery is tied in with vbulletin and as such resetting admin password and all that has to do with vBulletin and not Photopost since all user registration and accounts are handled by the forum. If your having a password reset issue in vbulletin you might want contact their support. If your gallery is not integrated with vbulletin as I am seeing please point me to this gallery as I had asked and please answer and questions in post 6. I had already posted I see no issues with Photopost internal registration password reset but would gladly give you a query to run if you where having email issues which this looks like to get you back in.