Is it for all videos or just a specific video? If it’s just for one video then a black screen could mean that the video is encoded in a format that the player can’t play. Re-encode the video using Handbrake or ffmpeg or just ignore the video and play something else.
If you have problem with videos that worked fine before then start eliminating error sources to pinpoint what’s wrong e.g., go to https://handyfeeling.com/local-video, connect your handy and select a video and a script to see if your handy works.
If it TheHandy works via HandyFeeling then test if you can use scriptplayer when TheHandy is connected via wifi.
If wifi works then start looking into what could be wrong regarding bluetooth and the apps related to that. I don’t use bluetooth myself so can’t give any specific advice on that. Doublecheck your settings is always a good thing. The following post shows a bit on that. https://discuss.eroscripts.com/t/scriptplayer-not-connecting-to-buttplug/67248/4