I've found a bug.
I usually download videos to my Linux box and watch them with http protocol, I think it's the easiest and fastest way to stream them on my home network.
I browser the directories through "Browser" tab, most of the time the app works well. But if the directory name ends with "mp4", for example, "http://linuxbox/abc.mp4/abc.mp4" the app won't be able to enter this directory "http://linuxbox/abc.mp4/" to access its content. I hope you will fix it soon.