admin no longer has access to shared folder

admin no longer has access to shared folder

So over the weekend I arrive to work, boot my PC and run the virtualbox
session of Ubuntu but now I get the message:
The folder contents could not be displayed You do not have the permissions
necessary to view the contents of "sf_virtual"
I don't understand what could have happened? I did install an update and
read an article to re-install Guest Additions and it still doesn't allow
access in /media. When I do gksudo nautilus and then sudo ls -al
/media/sf_virtual it will display all the files in virtual as -rwxrwx--- 1
root vboxsf numbers month date time filename. When I am under name in the
terminal ls /media/sf_virtual it returns Permission denied. Any ideas on
how to get access back? I have removed the shared folders and added new
ones but it still doesn't work.