Thanks for your report.
I have sent you an email with a debug version of WinSCP to the address you have used to register on this forum.
Since a week or so live sync regulary freezes as you see in the screenshot.
I have no clue what it could be related to, other than that it first occured after i for the first time saw the new message at startup saying "Donate to turn on auto update".
Once it has occured and i shut down the program and restart, the chance is very big it wil occure again.
Sorry i can't be more specific than this, but hope it rings a bell or something and that it can be fixed as it dirupts my work quite a lot!
Thanks in advance