same problem here, but it works if i start a second deamon. Wierd is i have to pcs with same windows version (updates etc) only difference is the processor (i7 4770 and r5 1600 (AMD not working)). After the installation the window vanished and i cant open it to log in.
on both systems the windows defender. The Thing is as i installed windows it worked on my amd system, after a month windows installed an update and i did some bios updates and driver updates,after that it broke.
I tried what @Survive did and started a second instance of seaf-daemon in a window and the client worked. Could communication over named pipes to the seaf-daemon that is instantiated by the client initially be blocked for some reason?
Sorry, to answer your previous question @marcusm, I am running ClamWin anti-virus and have Windows defender disabled. The other PC where the client works also has ClamWin installed.
I ended up reformatting my operating system drive and reinstalling with the latest build of Windows 10 to resolve a different problem. After doing that I have no issues. That’s obviously not a viable resolution strategy, but unfortunately I won’t be much help to continue troubleshooting. It is reassuring to know that if I didn’t reformat, version 6.2.11 may have resolved the problem or may in the future if the problem reoccurs.
I had the same problem on two PCs with freshly installed 6.2.11 today… when starting the seaf-daemon.exe by hand the client will start and you can use it normally, but then you have a console window open all the time.
Do you have Acronis Active Protection installed and running? I had the same problem, almost gave up. Then I found out you have to manually add seaf-daemon.exe to the list of trusted apps. This was really hard to find out because usually Avtive Protection gives a warning message when a possibly harmful app is found - not in this case.
Now Seafile client 6.2.11 is running fine!
Update: To clarify, Acronis Active Protection is a ransom-protection tool. The described problem might also apply to other apps of that kind.