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i would be inclined to say that it's because the full size image opens up in a new browser window.. which will be accessing the site so the autologin function is doing it's job, but too much..
i wouldn't say this is a problem with xcgal, more of a slight adjustment to the autologin script being used which wasn't accounted for when made..
i'm not a coder so i can't say fully, but that's my guess..
maybe some kind of check needs to be done on the autologin to check if the user is logged in or not, seems the new browser window is being treated as tho a user is coming back to the site.