This only started today but I've been losing control while on griffon and my movement keys do not respond. Sometimes it's just one key and sometimes it all of them. It goes away the second I dismount.
Someone on Reddit suggested that using 1 to dive sometimes locked skills, but sticking with v and c (or whatever you've remapped them to) avoids the issue.
(It's still something ANet should look at, but this should prevent you from accidentally enabling the super-secret mount #6: the Sinking Stone.)
"Face the facts. Then act on them. It's ...the only doctrine I have to offer you, & it's harder than you'd think, because I swear humans seem hardwired to do anything but. Face the facts. Don't pray, don't wish, ...FACE THE FACTS. THEN act." — Quellcrist Falconer
I used V and C without any problems.
The issue that I'm seeing is immediately when mounting to a griffon while moving. I've gotten locked out of using at least one directional key while often also stuck going in that direction too.
It's as if there's a syncing issue between my controls and the game that's only present when on a mount and is caused by something while mounting. It goes away the second I dismount.