I´m not sure that´s a big bug, but I had to spend a lot of time to correct thiat issue.
I have roland e-a7 connected via 5 pins midi cable to roland quad capture audio interface, everything works great,
but when I start Sibelius to type or compose some scores (I use VST sound in Sibelius, just a little pony - Roland - Sound Canvas,)
the first prepared staff of the orchestra sounds 2 octaves below it should sounds.
So I manualy have to edit 1st or sometimes 2nd channel , up it 2 octaves to make it sounds correctly.
And then, I´ve realized, first always should to be powered roland, and then sibelius, so in that case there isn`t any problem.
Hope, it helps to someone