Few patches ago Reforger game mods & Workbench mods (aka projects) were separated and right now both Reforger game ( %userprofile%/Documents\My Games\ArmaReforger ) & Reforger tools ( %userprofile%/Documents\My Games\ArmaReforgerWorkbench) are using two separate profiles. This change was made on purpose since users developing mods could accidentally join server with their local, non packed data or even modify content of packed addon (gproj or resource.rdb can be changed)

In any case, right now it is necessary to add any project that you want to use as dependency via "Add Project" button in Enfusion Workbench Launcher - after that you should be able to launch C&H or dependent mods as before

@reyhard: Thank you so much. By adding C:\Users\USERNAME\Documents\My Games\ArmaReforger\addons\591AF5BDA9F7CE8B it works.

Anyhow, I believe that this is a bug: When you have not added the CAH manually and open an existing project with this dependency, there is no error but you won’t be able to edit it.

Are you sure that addon is loaded in such case? When dependency is not found, Workbench cannot initalize itself. It is using then fallback solution which means loading bare Workbench with just Reforger data

You are right: It is not loaded. Imagine you don’t know anything about this topic, load a scenario that has dependencies that you have not loaded before. How would you understand that you need to load the dependencies and which they are. Workbench should give an error message about the missing dependencies.