1st Dorico "Crash"

Last night I printed a file - a current work in progress, and only had 1 page of music with a second page full of rests. I tried to print only page 1. This time there was no crash, however, there was a flicker of the screen (milliseconds) where Dorico seemed to go away then reappear. Dorico printed both pages and ignored the print page 1 only.

Robby