If you can.
Try enable the Application log and set log level to "information" and enable "save to file".
Menu -> Configuration > Core Settings > [tab] Logging.
To find the log file you can go to Menu > Help > Goto > Log Folder.
The file will be named "<date>-(num)-MultiCommander.log" it should have some text in it that says
"<date> <time> [Transfer2PortalDevice] ......"
I would be like to see all the lines with "[Transfer2PortalDevice]"
That way I can track down how far it really gets.