Release 2.2 still buggy
 

Good: no blinking or artifacts
Bad: up to 25 messages per second to the Console, repeating things like
6/11/14 5:52:10.670 PM WindowServer[164]: _CGXGLDisplayContextForDisplayDevice: No matching context for device (0x7ffb3c92c210) - disabling OpenGL

My iMac has also frozen a few times since I installed the driver, though I can't say definitively whether the driver causes it.
Details: Connecting a Dell 2412 to a 27" 2009 iMac over USB under Mavericks. A 2nd external display is connected via DisplayPort but that seems completely stable.

I still see 100% CPU usage - unplugging the dynadock and plugging it back in solves the issue - this newer 2.2 may be a little better, but not seeing a lot of improvement.

Would you be able to identify what driver you came from? I'm still using the 2.1 beta and it works upon a reboot almost every time. Sometimes I need a second reboot to get all of the monitors to be shown as working, but it always ends up working. I'll be honest, I'm not sure I want to go to anything else because I'm somewhat used to the bugs...

I came from the earlier 2.2 beta.