I opened a template file with colored tabs and saved it into a new file. It works fine.
Which version of Aspose.Cells are you using? Could you please post a simple project to show your problem? Thank you.
WorkbookDesigner wb = new WorkbookDesigner();
double exchangeRate = 1.23;
We have found and fixed this issue. Please try this attached fix.
Nope sorry, still the same.
Please change your code to:
Default format is Excel2000 which doesn't support tab color feature.