I don't use the auto-mount for just this reason. Delete the share, make sure that the share is not working when you reboot the guest.
Then create a manual share using the options switch (make permanent in the share screen just no auto-mount)
Code: Select all
mount -t vboxsf -o rw,uid=<your uid>,gid=<your gid> <share> <mount point>
Put this in /etc/rc.local after you are sure it works and you more than likely will eliminate your issues.
Note 1: I have no problem with shared folders, not even gedit. YMMV but I do this with a lot of guests and over 6 different hosts.
Note 2: manual mount on Windows guests also do not show this issue for me.