I am having the same problem with the HD driver(s) and 2.9.1. The current HD driver is only designed to work with 2.10x and higher, and for some reason has a three minute delay (on my system) before the command gets to the HD hub. A reboot of the controller fixes the problem for a few hours. We have checked the LUA log and the command is being sent immediately there, so I have no idea why it's taking so long to get to the hub. Given that I have the wrong Control4 version, I guess I'm lucky that it works at all.
I then tried a much older PowerView driver that's compatible with 2.9x. The problem with that one is that it only works via the programming tab and HD scenes, and the scenes don't show up to attach programming to. So I have to contact Cinegration to see if they can make sense of this.
I don't wish to give up on 2.9.x because it's the last Control4 version that allows IR control of the system so you can use 3rd party remote controls.
Control4 tech support was useless because it's a 3rd party driver. If anyone here comes up with a solution I would love to hear about it.