I'm also experiencing some keyclone 'hangs'.

The problem only appears when I'm closing down after playing, and I close the keyclone window. The keyclone windows disappears, but the applet in the tray still stays, and when I right click it, the menu does not appear, and I have to kill keyclone with task manager. I have to kill keyclone before I start another keyclone session.
In addition, as I close the keyclone window my system slows down for a few seconds, as memory is released, and the drive(s) work hard for a few seconds as well.

I did not have this problem when I used 1.8k, BUT... I was not using the integrated maximixer back then, I used the standalone maximizer and a batch file, instead of keyclones integrated maximizer, as I wanted the PiP functionality in keyclone

I run 3 WoW instances on 1 machine, so I only use 1 keyclone.