Do you have the latest version of the Doodad's plugin off Yanfly's website?
nvm, I see you said it's up to date
I would suggest going through the steps again, check each one off and make sure you didn't miss one. I had issues getting it to work at first too, it's not as plug and play as some plugins, but it's totally worth the effort! : D
I'm having the same problem :/
RMMV version is 1.6.1 (Up to date on steam), Doodads is version 1.9 (from Yanfly's website).
Installed the starter doodads pack, and the doodad.json file in the data folder. Clicking on F10 in-game doesn't bring up any menu :/