Import error for Excel 2010 file containing EOMONTH formula

I have an Excel file which uses the EOMONTH formula to calculate a date field. If the file is saved in Excel 97-2003 format it imports correctly into Mashzone. If it is saved in Excel 2010 format (.xlsx), then only the first line of the field containing the EOMONTH formula is imported. The rest of the column is empty. I spent much unnecessary time tracking down this problem.

Is there bug list available for Mashzone (I am currently useing version 2.2) which details issues such as this and possible workarounds?

Thanks

John Wignall