Hello,
I can confirm that the problem has something to do with the CH Manager. Yesterday, I uninstalled all my controller drivers and also uninstalled the CH Manager. After that rebootet my system, started FSX and everything was working fine.
Then I reinstalled my controller devices, using the built in Windows drivers for my CH devices. With these Windows drivers, the Buttons dialogue was working fine. After that I reinstalled the CH Manager and the Buttons dialogue was still working fine. But that changed after a reboot of the system. After this reboot the problem was the same again, the Buttons dialogue was hanging.
Maybe it has something to do with the CH drivers that come with the CH Manager (as soon as you install the CH Manager, the Windows own drivers get replayed by the drivers that come with the CH Manager).
By the way...I'm using the CH Manager Version 4.30 for Vista, since I'm running Vista with SP1.
Kind regards
martin