I think the first and the last events could be the problem, on the event you set it to load the reward video, but in the conditions you set a reward video is loading condition well It would never fulfil the action because no reward video is loading based on the condition. Also consider an alternative to the last events to keep your work neat and tidy.
In your screenshot, you say “If the reward video is loading … then load the reward video”. That’s not right, you need to load the reward video if it isn’t loading. Then in your last action you say “If the reward video is not loading … change the scene”. I’m not used to doing reward videos, but I guess you need something here that says “If the reward video has finished playing … change the scene”?
It’s been mentioned before… Looks like [condition: Reward Video Loading] could be cancelling out the [action: Load Video] … I think it reads this as saying “If the reward video is loaded, then load the reward video”, or the other way around… “If the reward video is not loaded, then don’t load the reward video”.
Based on the events in your screen shot, the cursor or touch must be on the load video before it checks if the video reward is given, and there is no way it would work, so it should not be a sub condition