I have this same issue too. Analyzing movies first doesn't work for me. It's usually jumping through a series of hoops. Uninstall/reinstall, reboot, rename streamfab temp folder, etc. Even after doing all this it's still hit or miss. Once it does start working, it's good for a day or so. I don't use it too often, maybe 1 to 2x/month. So each time I come back to it the issue resurfaces. The logs don't yield many clues either.
If I cancel the analysis, the content continues to play in the streamfab browser so it doesn't appear to be an access or DNS issue as it clearly can get to the content. This is just a wild ass guess but the only thing I can think of is streamfab appears to offer more dub and sub lang options than Netflix offers in my region. I'm wondering if something about the analysis pulling those dub and sub Langs for other regions is causing it to hang. Once it starts working though it's seamless, fast, it's usual ripping self.