Now even I'm having problems with 6.0.0.8. Can't navigate to subdirectories beneath /emmc/ (the removable sdcard is "emmc"), like /emmc/roms/. When I copy a file to /emmc via adb shell, CWM quits with a mysterious message about being unable to find the device for /emmc.
Flashing files from /sdcard (internal storage) works fine. Very strange. /emmc is the removable sdcard, which is FAT formatted... I suppose it could be corrupt, as FAT often is.
Hmm...
Happened to me too. If flashing from external sdcard, the file not found error will occur. I think it changed the name of the zip file somehow.
what happened:
1. i copied cm-9-20120719-UNOFFICIAL-p6200.zip into external sdcard
2. in cwm, it shows the file name as: emmc-cm-9-20120719-UNOFFICIAL-p6200.zip
3. there's an extra emmc on the filename