Hi Max,

Thanks for you update!
And I am glad that you have resolved the issue.
So far without detailed troubleshooting and debugging it is hard to confirm
if this is a problem in the Excel product.
I do understand your concern in this scenario, I highly suggest you can
submit this feedback to our product feedback center:
http://lab.msdn.microsoft.com/produc...k/default.aspx

Thanks for your understanding!

Best regards,

Peter Huang
Microsoft Online Partner Support

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