Testing with just a couple of addresses in a record set - messages seem to get through. But if I specify a progress bar - I get the "Can't load progress information" error (yes, the messages still are delivered). What is the file type or extension for whatever is stored in the temp folder?

Hello Ron,

The progress info is stored in a file in the temp folder. The file is named sm_[SessionID].txt usually and it is removed once no more needed. Temp folder you set is used only to store this file.

Regards.