Problem solved! After finding the Readme file in the DDPM folder, I switched from HDMI to USB-C input and DDPM now works with all options available.
Same issue here. New Max Studio M1 Max (macOS 13.2 Ventura) and all DDPM 1.1.0.0033 and 1.1.0.0034 Update menu options are greyed out except for Easy Arrange.
U4320Q, Mac Studio M1 Max, HDMI, DDPM broken again