kentishman wrote: ↑Wed Aug 23, 2023 8:28 am Not only is my small home system affected, but also the main system at work that I'm responsible for! Hopefully BI HQ (!) can come up with a fix ASAP

As a temporariy fix, try booting into Safe Mode with networking on. See if BI will then launch properly.

This worked for me. Hope it can help others.

In the run dialogue, type in "gpedit.msc" and hit ENTER on your keyboard.
Under Computer Configuration, expand Windows Settings, Security Settings, and Local Policies.
Click on Security Options. Don’t attempt to expand it, just click on it.
Navigate to the bottom and double-click "User Account Control: Run all administrators in Admin Approval Mode".
Select Disable, click Apply, and then Ok.

Until the fix you may run BI from Cmd. Tested and working.
Start Command prompt, Run as Administrator and type:
"C:\Program Files\Blue Iris 5\BlueIrisAdmin.exe"

You can also make a batch file using a text editor. Write the above line of code(with quotation marks), name the file something like "BlueIris.bat" and right click, choose run as administrator.
After BI starts you may close Cmd window

NickD wrote: ↑Wed Aug 23, 2023 9:06 am Until the fix you may run BI from Cmd. Tested and working.
Start Command prompt, Run as Administrator and type:
"C:\Program Files\Blue Iris 5\BlueIrisAdmin.exe"

You can also make a batch file using a text editor. Write the above line of code(with quotation marks), name the file something like "BlueIris.bat" and right click, choose run as administrator.
After BI starts you may close Cmd window

Merci, cela a fonctionner avec le fichier en .bat

NickD wrote: ↑Wed Aug 23, 2023 9:06 am Until the fix you may run BI from Cmd. Tested and working.
Start Command prompt, Run as Administrator and type:
"C:\Program Files\Blue Iris 5\BlueIrisAdmin.exe"

You can also make a batch file using a text editor. Write the above line of code(with quotation marks), name the file something like "BlueIris.bat" and right click, choose run as administrator.
After BI starts you may close Cmd window

Merci, cela a fonctionner avec le fichier en .bat

NickD wrote: ↑Wed Aug 23, 2023 9:06 am Until the fix you may run BI from Cmd. Tested and working.
Start Command prompt, Run as Administrator and type:
"C:\Program Files\Blue Iris 5\BlueIrisAdmin.exe"

You can also make a batch file using a text editor. Write the above line of code(with quotation marks), name the file something like "BlueIris.bat" and right click, choose run as administrator.
After BI starts you may close Cmd window

Awesome, this works for me! Much appreciated friend.

Good morning Nick !
This worked !!! Thank you so much !
So glad you posted this ! I hope others see it.
Thank you !

NickD wrote: ↑Wed Aug 23, 2023 9:06 am Until the fix you may run BI from Cmd. Tested and working.
Start Command prompt, Run as Administrator and type:
"C:\Program Files\Blue Iris 5\BlueIrisAdmin.exe"

You can also make a batch file using a text editor. Write the above line of code(with quotation marks), name the file something like "BlueIris.bat" and right click, choose run as administrator.
After BI starts you may close Cmd window

"Maybe the security certificate has expired and Windows is blocking it for that reason. You can right-click BlueIrisAdmine.exe to examine this."

This is the response I got from BlueIris support. No explanation of what I am supposed to do after right-clicking BlueIrisAdmine.exe. The app does not run. I am still waiting for an explanation of how to fix this.

Try Nick's solution - it works ! I did it first manually, then wrote the little batch file ( .bat ) and it works flawlessly.
You MUST get into the cmd line in admin mode for this to work though. To do that do this:
1. Press the Windows Start button at the bottom left.
2. Type in "Command Prompt".
3. Right click on Command Prompt and click "Run as administrator". Then just do what he said,
which is enter this INCLUDING the quotes:
"C:\Program Files\Blue Iris 5\BlueIrisAdmin.exe"
and that's it, it will run !

trigs wrote: ↑Wed Aug 23, 2023 2:07 pm "Maybe the security certificate has expired and Windows is blocking it for that reason. You can right-click BlueIrisAdmine.exe to examine this."

This is the response I got from BlueIris support. No explanation of what I am supposed to do after right-clicking BlueIrisAdmine.exe. The app does not run. I am still waiting for an explanation of how to fix this.

IAmATeaf wrote: ↑Tue Aug 22, 2023 8:36 pm Have you been playing around with local policy settings?

After Windows update 2023-08 KB5029351 getting the same message "blocked by admin" even with UAC off.