I'm running 5.8.4rc and find that logs are no longer created simultaneously during sessions. Only after closing the session or the client will the log be generated.
I assume that this behavior occurs due to the recent removal of log window.
It's quite inconvenient when in the middle of a running session, I have to check the log whether a file has been sent.
I really hope it is not intended to be so after log window removal. :)
For now I'm falling back to 5.8.2 beta where logging work as intended.