Hi, found a very similar topic.
https://forum.smplayer.info/viewtopic.php?f=2&t=9009This reminded me i had done the same change in registry, maybe you can debug with this information:
works
[HKEY_CURRENT_USER\Control Panel\Desktop]
"MenuShowDelay"="0"
doesnt
[HKEY_CURRENT_USER\Control Panel\Desktop]
"MenuShowDelay"="3000"
Curiously this is the only application where i have this issue, it's very anoying because sometimes i have movies with dual audio, for example, and the only way to change the audio track is with the arrows.
EDIT:Oh now i see what's going on, smplayer doesn't respond to clicks, i mean, if you set this value to 1000 you'll see that if you move the mouse quickly to a menu that has a submenu and click it, nothing happens, it'll wait the full second and then expand the menu, other applications work differently, while they may wait for 1000msec, if you click it, it opens immediately. If the value is much bigger that makes it not open by itself (example 4000), you can always click and it still opens, which was my case and the other user from the topic i mentioned. Best regards.