I can try to isolate a few of those variables. Are there any line numbers within trains that may point to the problem? I can run the debugger and inspect things there.

There could be a few things. The notebook path goes through a symlink a few levels up the file system (before hitting the repo root, though). I'm also in an anaconda env with a mix of conda and pip packages. The notebook kernel is also not the default kernel, but that's a common use case.

If it helps to know, I'm running on Linux with jupyterlab, and the trains-server is hosted on the same machine (using the defaults from the docker-compose.yml ). I'm on trains version 0.16.3 .

I checked the execution tab, but no repo information is listed. The "Source Code" table looks like:
REPOSITORY origin COMMIT ID SCRIPT PATH ipykernel_launcher.py WORKING DIRECTORY .
The "Uncommitted Changes" info is just the " Entry point for launching an IPython kernel." script, which I believe is boilerplate from trains. There's no mention of my specific notebook code.