Problem opening an reversed Oracle12c Model

Hi,

did someone faced an issue with reversed Oracle 12c models? I'm not able to open the model after I have created it via the reveres engineering process.

PowerDesigner simply hangs... Memory usage stays constant, CPU usage is at 50% but nothing happens. Model size is about 16MB.

We are running on PD 16.6.0.0 (4971)

Thanks,

Rafal