There are lots of things that could do this (poor mousing could result in you moving the drawing within its frame. Opening the drawing settings and clicking the
Fit Frame To Drawing may give some insight into what is happening).
The other thing I would add is: Is every single parameter associated with the saved view (layer set, pen set, model view options, scale, bla bla, etc) correct and properly assigned? Lots of people don't get the importance of this step....
But let's not pretend there is not a bug that affects this. 3D windows in particular are very prone to just going blank. Sometimes the drawing is there, it has just gone to an invisible pen. Sometimes a relaunch of AC fixes it. The bug was there in V10 and continues right along. Because this mostly effects 3D Views this is probably a topic for a separate post. Unless Olivia's missing drawing is a 3D view?
Nattering nabob of negativism
2023 MBP M2 Max 32GM. MaxOS-Current