To create Excel output, EZLease needs to start Excel in the background. This startup process takes time, and the progress bar cannot move during that step. Please be patient. (EZLease will wait a maximum of 15 seconds, and if Excel has not started by then, will give you the opportunity to interrupt.) If you create output to an XML spreadsheet, there is no such delay. However, XML spreadsheets have less formatting than Excel spreadsheets.
Do not use Excel while EZLease is creating an Excel report. If you change the focus in Excel to another workbook, Excel will get confused, and EZLease is likely to report an error.