After a pasting process, the FBD-editor does not react to user actions

Symptom: After FBD-elements have been pasted, no preview is displayed. It is not possible to paste the copied FBD-elements. Moreover, the FBD-editor does not react to user actions any longer. 

Cause: Probably, many FBD-elements and/or FBD-elements on several pages have been copied. A problem occurred when pasting these FBD-elements.

Solution: Close and restart  Neuron Power Engineer. Only copy the FBD-elements located on one page and try to paste these FBD-elements again. Repeat the copying and pasting process for each page.