I'm having a common Aspose.Cells problem, it generates invalid XLS files.
I've attached a VS 2010/12 solution that build my testing program and also an excel file that should be loaded by the tool.
(Don't forget to choose "XLS" in the tool for the output format)
Can you have a look as soon as possible since this problem has been reported in our production servers.
Also check that all pivot tables are kept as pivot tables in the output file.