Yeah, you've stumbled upon a bit of a toughie there...
I assume that, as you're running Release Candidate 1, you were also running
Beta 2?
This issue seems very limited, and I was hoping that it would have been
addressed in RC1 (I've yet to install. Everytime I try to download it comes
up as 907 bytes...). If you'd like some more details regarding it, check
back, there is a post started by ThrmanMunson15, titled audiodg.exe. While
his problem differed from yours (and mine), all responses seemed to be more
like yours. Hell, if audiodg.exe was eating just 300 MB of RAM... I've seen
it peak at about 1.73 GB, which is impressive, considering DWM and one of the
service host take up about 200 MB alone. Ending the process will gain me back
1.6 GB of ram and nearly 3 GB of pagefile, typically. Right now it's sitting
on about 375 MB, which is not really that big a deal at the moment.
As for details, I'd like to follow this up further, and see what can be
seen. Would you happen to be running a Creative sound card? I've seen no bias
as to x64 of x86 as of yet, but there seems to be a correlation between
Creative sound cards and this audiodg.exe memory leak. Perhaps we should
actually document some _useful_ information regarding this, and see if we can
get an MVP to stop by this post. Honestly, it's annoying having to kill my
sound. Some people can't even do that, such as ThrmanMunson15.