I've got a 3.6.8 installtion working, but I'm having a few link issues.
The integration works fine, with users being automatically created, and you can navigate down through the gallery fine, but I get page not found errors if certain variables are contained in the links.
I know that with the breadcrumb menu, if the link contains a highlightID variable, it won't work.
Also after uploading or changing any settings, I'll get a page not found error, although the upload/settings change will of taken place.
Outwith the embedded pages, everything works how it should, so it points towards an issue with either the gallery2.php, or the embed.php files.
I know that for the breadcrumb menu issues, the code could be altered to remove the highlightID stuff, but it's not going to solve the problems with other pages.