I have update VS Code to 1.27.2 and GitLens stop to work.
WIndows 10 x64,
Node:8.9.3
Same with VS Code 1.28.1 on MacOS X
GitLens isn't working on 1.28.1 x64 Windows 10
I am seeing the same
Version: 1.28.1 (system setup)
Commit: 3368db6750222d319c851f6d90eb619d886e08f5
Date: 2018-10-11T18:13:53.910Z
Electron: 2.0.9
Chrome: 61.0.3163.100
Node.js: 8.9.3
V8: 6.1.534.41
Architecture: x64
Can you please enable output channel logging by setting "gitlens.outputLevel": "debug" in your settings.json. This will enable logging to the GitLens channel in the Output pane. Once enabled, please reproduce the issue (if possible) and attach the log lines from the GitLens channel.
Turning that on does not result in any ouptut. In fact, I can even try running the command to show the welcome page, and I still get no output. Just the following error message on screen:

Hrm, can you try uninstalling GitLens, restarting vscode twice (make sure there are no running instances), and then reinstall GitLens?
If that still doesn't help, can you look in your extensions folder (~/.vscode/extensions) and see if there is more than 1 GitLens folder?
Hi. I just followed your latest instructions and it's still not working.
And in ~/.vscode/extensions I have only one folder of it. eamodio.gitlens-8.5.6.
Ok, I fixed the issue by reinstalling the Command Line Tools.
xcode-select --install
This is on Mac with macOS Mojave.
@marquezw before you installed the tools, when GitLens was failing -- was there any output in the GitLens output channel? I really don't see how GitLens could be failing without logging something.
Uninstalling and reinstalling the plugin worked on Windows as well.
@eamodio working well as you told
@eamodio I have uninstalled GitLens and after two reloads its began to work. Thank you very much!
Gitlens stopped working for me. I'm currently running VS Code 1.28.1 (user setup) on Windows 10 x64.
I tried to uninstall Gitlens, restart VS Code and install it again. It did not help.
When I uninstalled Gitlens, closed VS Code and removed the .vscode\extensions\eamodio.gitlens-8.5.6 folder, I was able to install Gitlens again.
I compared contents of the old and new folders and only difference is missing out\extension.js file in the old folder.

I had the same problem on Windows 10, VSCode 1.28.1. Tried to uninstall/reinstall many times didn't help. Then after an uninstall I removed the Gitlens related folders from .vscode/extensions then installed Gitlens and it started to work again o/
It seems that somehow GitLens was falsely identified as having a virus/trojan by some AV systems and they deleted the extension.js file 馃槩 It seems to have been fixed in the AV systems I've heard about, but unfortunately only a full uninstall/re-install will work
Now that you mentioned AVs, Eset complained about something and maybe quarantined it as well recently I think that was the extension.js file yes.
I am running ESET as well and had this issue occur. Silly admins putting apps on my computer, inhibiting my productivity!
@eamodio restarting twice help me
had the same issue on windows 10. Reinstall extension helped.
Scratch that, it was ESET that put a file in quarantine.
Myself, and my colleague both lost gitlens a week ago. Manually deleting the folder after uninstall and then reinstalling seems to have worked for us as well.
I had same problem in Windows 10 with VS Code 1.28.2. Tried uninstall/reinstall many times in only VS Code didn't help. Need remove the GitLens related folder and then it started to work again.
Depending on your platform, the location is in the following folder:
I'm closing this -- as the main issue seems to be extension installation issue, which I cannot control (vscode handles extension installation).
I hope this helps someone. Spent a week trying to understand why my gitlens was not working.
Opening visual code directly from the terminal using code command works.
https://code.visualstudio.com/docs/setup/mac
@viggy28 are you on Catalina?
Actually, I used to live near LA, so I thought you were asking about Catalina island.
Googled it. Well, I am in Mojave 10.1.4.3. VScode 1.36.1 GitLens 9.9.2. (I tried earlier different versions of GitLens too)
Hehe... hrm, I've only seen issues with Catalina.
Can you send me logs for when it fails? You can enable output channel logging by setting "gitlens.outputLevel": "debug" in your settings.json. This will enable logging to the GitLens channel in the Output pane. Once enabled, please reproduce the issue (if possible) and attach the log lines from the GitLens channel.
This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.
Most helpful comment
Hrm, can you try uninstalling GitLens, restarting vscode twice (make sure there are no running instances), and then reinstall GitLens?
If that still doesn't help, can you look in your extensions folder (
~/.vscode/extensions) and see if there is more than 1 GitLens folder?