JimH -
I have never used either Windows OneCare or Windows Defender. The system in question has GriSoft's AVG antivurus installed (as do 8 other computers throughout the house).
I also have not seen any evidence of MC12 using excessive or increasing amounts of CPU - only memory.
Here's an update on the APE files only, single zone only test:
As suggested, I restarted MC12 (immediately after a reboot), cleared "Playing Now" for all zones, and started a short playlist consisting of 8 APE files only (specifically 10cc's album "The Original Soundtrack") in Zone 1, set to repeat continuously. On startup, MC12's Private Bytes value was 30MB. Two hours later, 37MB. Four hours after that, 50MB.
If I'm able to let it run through the night, I will update these numbers in the morning.
Thank you again for your ongoing attention to this issue. You have a great product, and I would very much like to be able to use the latest version.
Jim L.
19 Feb 2007