This code to print the active sheet prints a blank sheet in PB2019.  I think it has been in my app since PB3.

long l_Job
window lw_Sheet

SetPointer(HourGlass!)

/* Print active sheet */
lw_Sheet = w_mdi_frame.GetActiveSheet ()
if IsValid (lw_Sheet) then
   l_Job = PrintOpen ()
   lw_Sheet.Print (l_Job, 1, 1)
   PrintClose (l_Job)
end if