Hi,
Not sure if this qualifies as a bug or not. I had a fairly simple drawing which would not print, ( blank in preview but shows in the print menu ) took me a day to figure it out. There was a polyline fragment too small to see ( just see the yellow "x" when clicking on the polyline in the layers drop down. ( poly line 38 in the attached file )
Deleting the polyline fragment allows printing and preview to work.
Chris