Ola Carlos,
This solution is weird but official
"The current playback engine does not support a sample rate of 48 KHz" error when trying to open a non-44.1 KHz session in Pro Tools M-Powered.
This will happen when Windows is using the MAudio device as the 'default' sound device.
SOLUTION:
Go to Start > Control Panel and choose "Sounds and Audio Devices"
Verify that the M-Audio device is NOT selected as the default device, or the device will be limited to 44.1 KHz.
http://www.digidesign.com/index.cfm?...0&itemid=22413
Ohh yeahhh do you need other audio card and setup as Default. Motherboards with audio onboard works fine as Audio Default + Protools.
Astalavista
Marcus - Brazil
www.purevolume.com/superbus