What's the difference between builds 1918 and 1920?

I see that RC2 has been released for general download. What's the difference between the latest internal build, 1918, versus this RC2 release? Are there enough changes to make it worthwhile to upgrade?

 

Sound issues are supposed to be fixed in 1920.

 

Where was it released? I see no announcement.

 

How about the USB support problem? One build my smart card reader worked, then it did not.

 

It fixed the sound issue I was having, namely that in the vm sound volume was topped out. This is no longer the case. Otherwise working fine for the application I needed to run in Windows.

 

Under 1918, sound stuttered pretty badly under Windows Vista. Now that does indeed seem to be fixed. Very cool.

 

The biggest difference between 1918 and 1920, for me at least, is that 1918 works, and...