Your post has my interest.
I upgraded my PC’s hardware recently and went from Windows 7 to Windows 10. Experienced connectivity problems (FW Active led blinking/not lighting up, audio playback interrupted, then after reinstalling I didn’t get any connection at all) with my Pro 40. Changed FireWire card in accordance to the recommendations on the Focusrite website.
Problems seemed to have solved but came back after some days.
Decided to uninstall the (after upgrade to W10) new installed MixControl 3.7 software and instead install version 3.4 (after consulting Focusrite Support). Going down this route also forced me to downgrade my Pro 40’s firmware first, before I could use the MixControl 3.4 version software. I’m not that could with the technical part of computers, so I’m not sure which driver is associated with MixControl 3.4, but I know that besides removing the 3.7 MixControl software, I had to separately remove the driver from the hardware manager as well, before installation of the 3.4 MixControl.
I hope you can still follow me...
Right now the connection between PC and Pro 40 seems to be solid, however I still do experience little “buggy” stuff. Sometimes when I open a project in my DAW (Cubase 9.5) I get the notification that some ports are missing or are unmapped.
Everything seems to work ok though, but I don’t like these unpredictable issues at all.
Like I said, I’m not good with technical stuff. Perhaps I should give the most recent MixControl version 3.7 another try, but I may have done something wrong with (un)installing the Pro 40’s driver that’s associated with the MixControl software...
And then again, what’s the difference with this driver and the VIA 1394 you are mentioning? How do I know I have the proper driver installed?
Is the VIA 1394 driver only the driver for the FireWire card and should I look into this too?
And is your system now stable?
I hope you can give me some advice.