This error occurred when I've tried to open a 2007 XLSX file using method LoadFromFile() "Unexpected token type: tEqual, string value: at position 1. Formula: =SUBTOTAL(9,O6:O11), Position: 2". Error occurs on both versions 6.6.x and 6.8.x. I'm using Windows 7 32bit SP1, .NET 2.0. I've attached this XLSX file here. This error wont happen if I save this file as XLS format to open it. Thank you!
BTW, there is an issue of unmatched color palette between MS Excel and Spire XLS, you can test with this attached file.