Some genius decided that to control your mount you’d have to use WSAD. I have an AZERTY keyboard so I use ZSQD. Would have been nice had they used the same key bindings. For now mounts are not an option for me. Also the Night-Stalkers Mask no longer gives a noticable change. No more night-vision 
In all I’d say this patch is a major ■■■■ up)
This issue has been pointed out several times, hopefully they’ll come with a fix. IMO they should just use keys defined for the character instead of adding customisation specific to mounts. I mean nobody want to use different keys to move mounted.
You can change settings directly in files for now as explained here, or press ctrl+shift each time you mount/dismount to switch between AZERTY and QWERTY if you have enabled these two modes on Windows.
ust found the topic where they mention the input.ini file. Just edited it and I’m gonna have a test now.