If I'm doing a regular Windows file transfer between my PC and a Samba server on my network, and then start a WinSCP regular FTP transfer between my PC and my smartphone, suddenly the Windows file transfer speed comes basically to a halt... it will be sort of barely keep going but in a very start-stop manner and only a few K per second. Once the FTP transfer ends, things go back to normal.
My PC is connected via gigabit ethernet to a switch that then connects to the wireless router... network capacity to my PC is not a problem. Previous up until recently both transfers would go at full speed without interfering with each other.
I could go back to 5.1.7 and test it to see if that version works OK - but is it safe to downgrade from 5.2 RC?