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Google chrome still seems to work best for me (even though most videos don't play at all). I think the matter of the format is mostly what plays a roll here. Took me a while to find this back... But this is what someone else said about the format: "you need to upload in mp4 or webm format on dtube."

Little details, good to know. Thx

Your welcome, hope it helps, never uploaded anything myself so haven't been able to test it.