I am also seeing this issue using Jupyter 4.4.0 - when I run one cell, sometimes all the cells above become blank - inducing mild panic - I am using Edge on Win 11. I have found that if I right click and undo cell operation, they re-appear (might help Sun_Bear as that’s a bit quicker than closing and reopening), but it is very disconcerting. Any update on this issue?
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I also see this in Jupyter 4.4, Chrome and Linux.
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Seeing this in 4.4 on Firefox/Windows. It is tricky to reproduce, but I’m adding gif reproducing it.
The disappeared cell typically comes back when I click on a nearby cell or something – in this gif it worked. But it isn’t 100% reliable. I do live coding demos for teaching – this makes it tricky 
I just started noticing it in the last month, but I haven’t tracked versioning.
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Seeing this issue with Safari + jupyter lab v4.3.3
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Seeing this issue with JupyterLab 4.3.4 on Sarari 18.5. Disappearing cells. Also adding cells with escape-a or escape-b will put the new cells at strange places, sometimes a few cells higher or lower. And even weirder, sometimes JupyterLab remembers in what order code cells were run. Very difficult to reproduce. Is generally solved by Kernel - Restart - Clear Output of all cells. Or if that doesn’t work, restarting Jupyter Lab.
Does anybody know of the latest version where this does not occur? I guess I am ready to go back to that version.
This was happening to me in Chrome. I’m not sure which version completely addresses the issue, but duplicating the tab containing the notebook worked for me. The cells reappeared and I didn’t have to restart the kernel.
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My kernel or service restart doesn’t resolve thge problem and my problem also exists when running my TLJH service on the latest Chrome. One thing I am not sure about is the version of Jupyter Lab. It says it runs JupyterLab 4.3.4, but people are saying elswhere to use 4.4.4 and for the life of me even though I have JL4.4.4 updated across the board it remains 4.3.4.
Is TLJH currently ceilinged out at 4.3.4 or am I doing the updating process wring (and if so “who” do I have to be to get the Jupyter upgrade to hold? [As I try to tell the people around me, I am NOT a system admin and the service is mostly for my student’s benefit, so I am poking in the dark here.]
I’m very thankful to the developers for the JupyterLab environment. I have been having this problem for the last year. I have updated Safari and JupyterLab versions, as I heard a solution was produced, but nothing has changed. My current versions are Safari 18.6 and Jupyter Lab 4.4.6. Is there any new development?
Hello!
I have the same issue (some cells just disappear with the blank canvas). I am using Jupyter lab 4.4.10, Google Chrome 142.0.7444.59 and Ubuntu 24.04.3 LTS. I had the same issue before and then installed Jupyter lab 4.3.0, as there is no issue with that version. Recently, I upgraded JupyterLab to see if the issue had already been fixed. With version 4.4.10, the issue is back. I am downgrading to 4.3.0 as a temporary solution.
I am also encountering this problem in jupyterlab 4.4.10. I’m on a macbook pro (M4, Sequoia 15.6.1) and I tried Firefox 143.0.4(aarch64), Safari 18.6 and Chrome 142.0.7444.60.