If the first export is not working, usually it will make the GIMS application hang too. Please follow below steps to export to Excel in GIMS
Step 1 - If GIMS hang, please close all GIMS and re-login
Step 2 - Open Student Statistic
Step 3 - Open a new excel blank workbook
Step 4 - Try export again
If you have any difficulties, do let us know on the ticket and we will assist accordingly.