I have one cosmetic bug to report. I have quite large workpace with several tabs open and after installing version that implemented https://winscp.net/forum/viewtopic.php?p=53755#53755 I encountered slight workspace bug - position of one workspace tab is not properly saved.
Im attaching screenshots:
1.screen - tab positions before I save workspace and close winscp
2.screen - tab positions after reopening winscp - it looks like one tab position is moved
WinSCP 5.6.5 #4982, win7 x64
Hope this helps,