Regarding your 0kb issue this is a known issue and is due to the fact that since EV6 SP2 we ctarted to use sparse files and even the latest version of onTap does not support sparse files so that is why you are getting the 0kb file size. Netapp are aware of this and we are waiting for them to support sparse files so this is not symantecs issue.
Regarding your visio file problem I have not personally come across this issue so I would recommend getting a support case open so we can look into it.
When I am in tomorrow I will have a go with a visio file on my test system and see what happens
Cheers...Paul