Log in using LinkedIn works on the dev. site but not on the actual site.

Hello,

I am having a problem with the LinkedIn integration module. I am trying to get the "Log in using LinkedIn" work. I have two versions of the site and both of them are on separate servers: one is a dev. site where we try out new functions and use it as a testing environment and the other is the actual site.

We are using Logintoboggan module and I read somewhere that this might cause problems with different modules. Despite that I got the "Log in using LinkedIn" to work on our dev. site just fine but when I try the same thing on the actual site the "log in using linkedin" button takes users to a blank page.

This is extremely weird because at the moment both our dev. site and the actual site are almost identical (different server etc. ofc.) and I have made one application for each site on the LinkedIn developers site.

I'm using the latest version of Drupal 6 and all my modules etc. are up to date. I found that there are some patches for Logintoboggan and I have tried some of them, but they have changed nothing - the same problem still exists. I am also using Twitter-module which gives the opportunity to log in to our site with existing Twitter-account and this works just fine - hence I figured that this might be a LinkedIn Integration problem.

All help is extremely appreciated and I already thank you in advance for any advice.