I upgraded to Feisty over the weekend. Everything appeared to have gone through smoothly. However, I found that I could not access my Feisty shares from my other Linux / Windoze boxen. The connection just failed. I could however access other samba and windoze shares _from_ the Feisty box (which was living up to its name :S). So, I tried going into System Settings, Sharing to sort things out by fiddling with the options, making everything readable and writable by everybody, enabling guest account access and so on and so forth.
All to no avail.