Critical Alert: Can't encrypt folder...unable to move origin

Hi,
Just bought and installed Espionage on my MacBook Pro with Snow Leopard and Intego NetBarrier X5 installed. Tried encrypting a folder with client's property pics and details docs (600MB) but keep getting this message;
Critical Alert - Can't encrypt folder because we're unable to move original to the trash
Have since tried with 4 other folder of various docs and sizes with the same result. Can anyone advise what I'm doing wrong?
Cheers
Just bought and installed Espionage on my MacBook Pro with Snow Leopard and Intego NetBarrier X5 installed. Tried encrypting a folder with client's property pics and details docs (600MB) but keep getting this message;
Critical Alert - Can't encrypt folder because we're unable to move original to the trash
Have since tried with 4 other folder of various docs and sizes with the same result. Can anyone advise what I'm doing wrong?
Cheers