Based on the screenshot of you package versions, it does seem like tensorboard is not installed there. We depend on that, because every scalar logged to tensorboard is captured in ClearML too. My guess would be that maybe you installed tensorboard in e.g. the wrong virtualenv.

However, you do say you tested it with Tensorboard and even then it didn't work. In that case, are the scalars correctly logged to tensorboard? You should be able to easily check this by doing a run, and then launching tensorboard to see if the scalars are coming in. If they are, but ClearML is not receiving them, it's probably a bug.

Would you mind checking that? In the meantime, I'll launch a version of my own with your script and see if I get the same issues