hey there, I’m not sure if this belongs to jupyterlab/jupyterhub github issues.
But I’m experiencing strange behavior when spawning notebooks that are based on jupyterlab 4.x, the server seems to spawn them just fine, but when it comes to show the notebook UI, it just shows a blank screen 
Check the javascript console and reload the page. There may be errors failing to load something.
Errors from the javascript console and the singleuser server startup logs may help identify the problem.
Hi thanks for the insight, I looked on the Javascript logs and it seems like i have unsatisfacied version of some of the npm packages, but i configured my .npmrc file to the artifactory that has the updated versions but it still throws warnings on it… Maybe i didnt put the .npmrc file in the correct place in the jupyetrlab filesystem? Any more insight would be very helpful! :
This does seem like the jupyterlab bundle isn’t quite built right.
You might try running:
jupyter lab build
to get a fresh build of the bundle.
Can you share the output of jupyter troubleshoot?