I´ve experienced, that blank excel window gets stuck during process, although all the activities run smoothly (even when handling excel data numerous times whit diferent excel files or sheets), but at the end of the entire proces, there is excel windows hung on the taskbar. When I click on it I can see excel window (in the attachment).
I didn´t get the point. Could you be a little bit more specific? I found out, that after 1st excel activity, excel closes properly, it appears on handling excel file 2nd time on the taskbar and the excel windows doesn´t close from that point.