I turned on text logging, Level 1 and asked to display the console (?) window, changing it to the last 500 lines.
I got a couple entries immediately while the program was keeping the connection alive (I think) then I dragged a file from the upper right to the upper left window and the program froze "WinSCP (Not Responding)"
This ftp xfer does not hang like this when logging is off.
Also I have the program on my M:\ drive and was logging to C:\TEMP\filelogname.txt