Thanks for your posting and using Aspose.Cells for .NET.
We at Aspose wish you a great 2013 year. Please keep us in your good wishes as well.
We were able to replicate this issue using the latest version:
We have logged this issue in our database. We will look into this issue and fix it. Once the issue is fixed or we have some other update for you, we will let you know asap.
This issue has been logged as CELLSNET-41330.