Jupyter Lab - launches but don't see any tabs (look/feel is 100% different than seen in youtube videos)

Question

I have jupyter notebook version 4.2 on my MacOS (10.9.5)

I launch via jupyter lab at the MacOS terminal and it automatically opens a browser at the following link: http://localhost:8888/lab

At this point I see the Welcome to the JupyterLab Alpha preview screen but nothing more. No tabs etc. Please see the image I have included.

I am using Chromium (Version 43.0.2357.130 (64-bit) ). When I try to open in Safari browser absolutely nothing loads. Its a blank browser session.

What I see in the browser doesn't look like anything that I have seen in all of the JupyterLab videos on youtube (PyData 2016 DC for example).

Clearly there is something wrong with the rendering.

UPDATE:

Output in the console:

WebSocket connection to 'ws://localhost:8888/terminals/websocket/1' failed: WebSocket is closed before the connection is established. http://localhost:8888/api/contents/untitled.txt?1485120059877 Failed to load resource: the server responded with a status of 404 (Not Found) http://localhost:8888/api/contents/DeleteMe.ipynb?1485120060078 Failed to load resource: the server responded with a status of 404 (Not Found) 

Output in the MacOS terminal:

[I 16:20:58.569 LabApp] JupyterLab alpha preview extension loaded from /Users/user1/anaconda/lib/python2.7/site-packages/jupyterlab [I 16:20:58.570 LabApp] Serving notebooks from local directory: /Users/user1 [I 16:20:58.570 LabApp] 0 active kernels  [I 16:20:58.570 LabApp] The Jupyter Notebook is running at: http://localhost:8888/ [I 16:20:58.570 LabApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation). [W 16:20:59.883 LabApp] No such file or directory: untitled.txt [W 16:20:59.884 LabApp] 404 GET /api/contents/untitled.txt?1485120059877 (::1) 3.88ms referer=http://localhost:8888/lab [I 16:20:59.893 LabApp] New terminal with specified name: 1 [W 16:21:00.095 LabApp] No such file or directory: DeleteMe.ipynb [W 16:21:00.098 LabApp] 404 GET /api/contents/DeleteMe.ipynb?1485120060078 (::1) 5.14ms referer=http://localhost:8888/lab [W 16:22:35.969 LabApp] 404 GET /lab/xterm.js.map (::1) 64.85ms referer=None [W 16:25:30.075 LabApp] No such file or directory: untitled.txt [W 16:25:30.076 LabApp] 404 GET /api/contents/untitled.txt?1485120330069 (::1) 1.74ms referer=http://localhost:8888/lab [W 16:25:30.101 LabApp] 404 GET /lab/xterm.js.map (::1) 3.18ms referer=None [W 16:25:30.296 LabApp] No such file or directory: DeleteMe.ipynb [W 16:25:30.297 LabApp] 404 GET /api/contents/DeleteMe.ipynb?1485120330283 (::1) 1.73ms referer=http://localhost:8888/lab 

Output of browser console:

UPDATE:

Here is a specific video of Jupyter Labs I watched:

JupyterLab: Building Blocks...

What I see is very different than what is shown in the video. There are many other videos on youtube.

UPDATE #2:

I followed Feynman27's instructions here however I get the same result. See screen shot. I see where it says, Click on the Launcher tab for the initial JupyterLab screen, however I can't find where that is.

UPDATE #3:

I updated my browser to Chromium Version 56.0.2924.87 (64-bit).

Now all works fine. I see the tabs.

Answer 1

I could not find an answer to this issue on Windows when searching Stackoverflow/Google/Bing, and this thread was quite prominent hence my Windows-specific answer here.

CTRL+SHIFT+ENTER did not work for me. On windows 10 with Jupyter 4.4.0, Jupyter Lab 0.35.4, the tabs in Jupyter Lab can be made visible/hidden by clicking CTRL+SHIFT+D or toggling in the menu the options (View > Single-document mode).

Jupiter Lab, menu item for toggling the Single-document mode