I\'m using Windows and Virtualbox with RedHat, putting it simple: I\'ve created a shared folder so I can use Eclipse on my Windows OS and do some testing in Linux.
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After adding the user to the vboxsf group, you might need to completely log out of the gnome/xfce/??? session, because someone long ago decided that group affiliation should be cached at first login to the window system.
Or go old school:
% newgrp vboxsf
in any shell you want to use to access the folder. Luckily, newgrp looks up the group list for itself and doesn't used the cached values. You'll still need to log out and back in to access the folder from something other than a shell.