Inevitably with something new you have problems the same can be said about D Tube following @heimindanger advice and the problems running some uploaded video onto my dtube account it was recommended I install "webtorrent for the desktop" available from https://webtorrent.io for your system. This for me at least, enabled the running to completion the video I had had trouble with in the first place, you can read more from heimindanger here on the subject here https://steemit.com/dtube/@heimindanger/d-tube-0-4-serious-ui-lifting-and-ipfs-backup-and-new-domain-and-more this will give you some insight into IPFS and webtorrent and how it all works or at least what is been done about some of the problems encountered so far.