Drawing Views Disappeared Creo 8

[KB_9100625]

So a drawing that has been in our system for sometime has suddenly lost all the views on each sheet of the drawings. the views still appear on the drawing tree but on the page no view can be seen including dimensions and balloons. 

[StephenW]

Are you using PDMlink? Folder structure management?

Are you sure you have models available to open, like search paths or models added to workspace?

Try opening the model before opening the drawing?

Any possibility of a model rename when the drawing wasn't in session or if the drawing wasn't saved after rename on the model?