I am running 5 Ubuntu boxes 4 are Hardy and 1 is gutsy all with XP SP2 Guests.
When I install or updated to virtualbox 1.6.2 I had to install guest additions several times to get network shares working.
For example: I had my Documents folder shared in 1.5.6 on a gutsy box and a net use script that mounted upon login. As soon as I upgraded to 1.6.2 and installed guest additions the net use script wouldn't work. I knew this problem existed from my other boxes and installed them again, no worky, again, no worky, and finally the 4TH TIME my net use script mounted it automatically.
Thank you for your product.