Origin Version (Select Help-->About Origin): 7.5 SR5 Operating System:
The Origin crashes when trying to average multiple curves while the calculated columns (=>set column values) are set to AutoUpdate. Releasing this 'constrain' the averaging works well.
I tried to reproduce this with version 7.5 SR5, but could not. It could be that the problem is triggered by something in your data, or something in the way in which you define your column forumulae.
It would be best if you sent your Origin project file to tech@originlab.com. Please refer to this forum post in your correspondence.