So I opened four drawings from the open window in SW16 at the same time.
Three reference different models, while the last is an assembly and references two of the models from the other drawings.
I received a message:"The document being opened references a file with same name as an already-open document." which had an auto-dismiss.
It chose to "Open without this document" and I just went with it to see what would be suppressed and thus not referenced.
There were no missing references... so I just ignored it.
Five minutes later the same message has popped up twice... yet I have not opened any new documents.
It just keeps popping up even though I already dismissed the message in each drawing.
In the time it took to type this post I had to dismiss six more messages!
What is SW doing???