All aboard!
No problem for jumping in. Though generally it's best to create a new topic unless your issues are directly related to the rest of the thread.
First off, the v2.0 SCLogin module can be downloaded below in case you want to revert:
www.sourcecoast.com/index.php?option=com...ease&Itemid=248&id=4
As for your issue, jQuery is used to load the modal popup. It sounds like there's likely a conflict in jQuery itself, which is odd, but may be caused by different versions. We're using v1.9.1, which is backward compatible, but it may introduce some issues somewhere. Can you post, or Private Message, me a link to your site where we can see the troublesome module? We're planning to release v3.0.1 (hopefully) later this week, so if there's a fix we can implement to make things more compatible then, we'd love to do it.
Thanks,
Alex