The other day my computer got stuck in an auto repair loop. So I had to reset and reinstall some programs, including BB and RB. Now, a song that was close to finished has this unusual problem. On one midi track, the sound is piano for 36 measures. Then it changes to something else that sounds like midi guitar for two measures. Then it changes back to piano.

Anyone have a notion about the cause and the fix? Thanks.

2b
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i5-3210 laptop. Win 10 Home. 2.5ghz, 64 bit. 6gb RAM. Focusrite Scarlet 2i2.