If ControlDraw found a model with the same name in the Parent or or sibling folders to the one that the Area model is in then the message will also say Using *** where *** is the full path to the reference model it found and will say "Do you want to change the model to point this one?", with Yes and No buttons.
When finding the reference model, CD first looks at the exact path and file defined in the Project Options
If it is not there then the search go up one level to the parent folder of the folder containing the area model and looks for the file there.
If it is not there then the search goes down into all all sub folders of the parent folder and uses the first one it finds
To make it easy to share models with users who have different drive mappings, put the reference model in the parent folder of your area models, or in one sub folder of the parent folder of the folder containing the area model.
If you want to stop the 'Can't find - Using" message then you can answer Yes. This will change the setting in Project Options to point to the Found area model so that the message will stop appearing.
If you do not have access to the Reference Model and you want to prevent these messages switch on Disable Automatic Synchronising in the Login form when you start ControlDraw. That will stop all synchronsing except when you conciously decide to by the Right Click menu in the List of diagrams or the Synch button in the Page details, classes etc.
Do not keep multiple copies of your reference model in you project folders