You could check if the folder contains some Tensorboard-related files and if so maybe refresh Tensorboard itself.
Personally, I haven’t used Tensorboard much as I was always running into similar trouble of displaying the data “live” (I must admit that I’ve tried it a few years ago so things might have changed/improved by now).
Back then I’ve stuck to visdom 3, which didn’t support all the features of Tensorboard but was a better fit for my use cases (more flexibility to display plots and they were shown immediately).
I’m not sure if you need to use Tensorboard or if displaying the curves via matplotlib in your notebook would also work.