Copy and Paste won't retain key in Ubuntu 10.04

Hope this is an easy fix:

Running Ubuntu 10.04, Musescore 0.9.6

I set up a brass quintet score, 2 Bb tpts, horn, tbn, tuba.

I enter notes into the 1st trumpet part. When I copy and paste the entry into the 2nd trumpet part, the key changes, with new accidentals (i.e., what was in G on the 1st trumpet part is now in F# on the 2nd trumpet part). I copy and paste into the (non-transposing) trombone part and the key is fine. I view all in concert pitch and still have trouble retaining the key when I copy to the staves for the transposing instruments.

Thanks.