Cell content disappears

[otobrzo]

From time to time the content of cell in my notebook just disappears.

It starts with freezing of cursor at a specific position in the cell and then all just disappear.
I can export the notebook to the script and the cell content is there. The parts of the code can disappear due to the keyboard activity in the emptied cell.

using ProgressMeter
using Flux: @epochs

N_epochs = 500
loss_train = zeros(Float16,N_epochs,1) 
loss_test = zeros(Float16,N_epochs,1) 

#evalcb() = @show(loss(gpu(test_X), gpu(test_Y)))

@showprogress 1 "Computing..." for epoch = 1:N_epochs

    Flux.train!(loss, params(model), dataset_batch, opt)#, cb = throttle(evalcb, 5))
        
    loss_train[epoch] = loss(gpu(training_X), gpu(training_Y)) 
    loss_test[epoch] = loss(gpu(test_X), gpu(test_Y))
    
end

It is not connected to anything specific in the code.

Julia 1.3.1
IJulia v1.21.2
python3.7
jupyter core : 4.5.0
jupyter-notebook : 5.7.8
qtconsole : 4.3.1
ipython : 5.8.0
ipykernel : 4.9.0
jupyter client : 5.2.4
jupyter lab : 2.0.0
nbconvert : 5.4.0
ipywidgets : 6.0.0
nbformat : 4.4.0
traitlets : 4.3.2

ubuntu 19.10

[jmert]

This is* a bug in CodeMirror (codemirror/codemirror5#6064) in performing the syntax highlighting for Julia code. I've seen the same problem, and it took my quite a while to track down this issue as being exactly what I was running into.

* The caveat is that I don't see your code having any numbers with a leading 0 as was reported in the CodeMirror issue (and is exactly the behavior I was struggling against).

[stevengj]

Indeed, it sounds like a CodeMirror bug. Please file a CodeMirror issue if this has not been resolved by the latest CodeMirror…

[M007-lab]

Same Issue here. It really occurs a lot !