DDPM not working on macOS 26

Hi all,

I have two Dell U2723QE monitors, they work great. I use these with a MacBook Pro (M1 Max, 14-inch, 2021) running macOS Tahoe 26.1.

I've been using Dell Display and Peripheral Manager (DDPM) for a few years without an issue, but since upgrading to macOS 26 I can't get DDPM to open. When I launch it I get a dialogue box saying:

• "DDPM.app" would like to control this computer using accessibility features. Grant access to this application in Privacy & Security settings, located in system settings."

However, DDPM is already toggled to 'allow' in settings. I've tried toggling this on/off several times, but I still get the same error - it's as if DDPM is not recognising that it does indeed have the required system access.

I've tried uninstalling and re-installing DDPM twice (version 2.1.1. - the latest version available for download), but the issue persists. 

Any ideas?

Many thanks,

Carey