before and after installing the ceritificate I cannot save settings (no proxy)

granted user admin rights and they installed it. Installed quick but takes a long time to start as with separate folder. Save still just spinning circle after 5 minutes.

My mistake on windows version. It's 2016 data center (1607  14393.4169) and as mentioned is a term server.

I have the same story with Everywhere on Windows version 1909.   I click Save and it spins infinitely.  Instead of private conversation, please post the solution publicly.

There was no solution. They said they'd look into it. They said it was complicated by my having it on a terminal server in addition to being on windows server. I haven't heard back since.

Having same issue, I checked the app logs and found some error message.

netcore.log shows that fiddler could not find the settings file.

[2021-03-10 10:53:09:106] [Error] [NETCore] Could not find file 'C:\Users\XXXX\.fiddler\d6xxxxxx-xx75-4d25-96xx-xxxx64ee18\Settings\appsettings.json'.
System.IO.FileNotFoundException: Could not find file 'C:\Users\XXXX\.fiddler\d6xxxxxx-xx75-4d25-96xx-xxxx64ee18\Settings\appsettings.json'.
File name: 'C:\Users\XXXX\.fiddler\d6xxxxxx-xx75-4d25-96xx-xxxx64ee18\Settings\appsettings.json'
   at System.IO.FileStream.ValidateFileHandle(SafeFileHandle fileHandle)
   at System.IO.FileStream.CreateFileOpenHandle(FileMode mode, FileShare share, FileOptions options)

eletron.log: 

[2021-03-10 10:47:06:290] [error] {
  constructor: 'Error',
  killed: false,
  code: 1,
  signal: null,
  cmd: `PowerShell -Command "$processesWithTypes = Get-WmiObject Win32_Process | Where-Object {$_.Name -like 'Fiddler Everywhere*'} | Select-Object -Property ProcessId, @{Name='Type'; Expression={If ($_.CommandLine -Match '--type=(\\S+)') {$Matches[1]} Else {'browser'}}};Get-WmiObject Win32_PerfFormattedData_PerfProc_Process | Where-Object {$_.Name -like 'Fiddler*'} | Select-Object -Property @{Name='type'; Expression={$id = $_.IDProcess; ($processesWithTypes | Where-Object {$_.ProcessId -eq $id}).Type}}, @{Name='processName'; Expression={$_.Name}}, @{Name='pid'; Expression={$_.IDProcess}}, @{Name='cpuUsage'; Expression={$_.PercentProcessorTime}}, @{Name='memoryUsage'; Expression={$_.WorkingSet / 1MB}} | ConvertTo-Json"`,
  stack: `Error: Command failed: PowerShell -Command "$processesWithTypes = Get-WmiObject Win32_Process | Where-Object {$_.Name -like 'Fiddler Everywhere*'} | Select-Object -Property ProcessId, @{Name='Type'; Expression={If ($_.CommandLine -Match '--type=(\\S+)') {$Matches[1]} Else {'browser'}}};Get-WmiObject Win32_PerfFormattedData_PerfProc_Process | Where-Object {$_.Name -like 'Fiddler*'} | Select-Object -Property @{Name='type'; Expression={$id = $_.IDProcess; ($processesWithTypes | Where-Object {$_.ProcessId -eq $id}).Type}}, @{Name='processName'; Expression={$_.Name}}, @{Name='pid'; Expression={$_.IDProcess}}, @{Name='cpuUsage'; Expression={$_.PercentProcessorTime}}, @{Name='memoryUsage'; Expression={$_.WorkingSet / 1MB}} | ConvertTo-Json"\n` +
    'Access is denied.\r\n' +
    '\n' +
    '    at ChildProcess.exithandler (child_process.js:308:12)\n' +
    '    at ChildProcess.emit (events.js:210:5)\n' +
    '    at maybeClose (internal/child_process.js:1021:16)\n' +
    '    at Process.ChildProcess._handle.onexit (internal/child_process.js:283:5)'
}

So I guess the root cause here is the PowerShell of my device is disabled due to organization's security policy, and fiddler could not create the settings file. Not sure we are having same root cause, wish help troubleshooting.

Microsoft Windows [Version 10.0.18363.1377]
(c) 2019 Microsoft Corporation. All rights reserved.

C:\Users\XXXX>powershell
Access is denied.

From .fiddler on down I have full control permission. the Settings folder is empty.

I have the same problem in windows 1909. Any updates on this.

I have the exact same issue on both the Windows and Ubuntu versions of Fiddler Everywhere. I'm on Ubuntu 20.04.01 (5.8.0-40-generic) and Windows 10 Enterprise 1809. Would greatly appreciate an update.