After nonstop playing around with NAS settings and google, I FINALLY figured out why the Pi wouldn't play anything from the multimedia folder and I kept getting the picture above.
Under the QNAP NFS settings, the SQUASH options drop down box was set to ALL_SQUASH and when I changed it to NO_ROOT_SQUASH everything started working again. I realized that all of my IP settings were correct in the permission section, there were no settings in the Pi I could see, so I gave this a try. I decided to check other folders and noticed this one was not like the rest for the SQUASH setting. Not sure how it ended up changed, but when I changed it, everything in the multimedia folder now works again on the Pi.
Only took me a whole week to figure it out. lol