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TMS IntraWeb Component Pack Pro
When using TIWAdvGridExcelIO to send an XLS file to the browser, my app freezes.

IntraWeb forms have a property called LockOnSubmit. This is to prevent the user from double clicking on a form when a submit is already in progress. However, it is incompatible with some functions such as SendFile and SendStream. If you are performing any of these, make sure this property is set to False in the form where they are used.