I'm afraid that this beta might has brought back the infamous mouse freezing.
Example: I was downloading a file and when it finished the mouse froze for a few seconds. A quick glance at Windows Task Manager showed DF with 50% CPU usage. It happened again when I tried running it (it was an installer).
I noticed I had PreventSystemHooks on from previous versions. I will disable it and test again.
I didn't have that registry string, I added it manually. I'll try it and report back.
I've experienced no freezing since beta 3, some lag though. Still, not as bad as before.