A new cutting-edge version of Posterino is available. You can now scale the document independent from the graphic objects via the “Scale graphic objects” checkbox under “Poster” > “Scale…”. Please let me know if you find any issues with this new build.
If you like to give it a try, use the automatic software update build into Posterino. Choose “Software Update…” from the “Posterino” menu. Don’t forget to watch for “Cutting-Edge” releases (“Posterino” > “Preferences” > “Software Update”). Or just use the link below to download Posterino: