First I thought it was a dns issue (which I suitably modified in /etc/resolv.conf) , but after I realized that I could see the list after unmounting the disk (then I can remount it, and appbrowser continues to work, but not if I close and reopen).
Then Appbrowser fetch the package list unless I start with the disk removed.
I can not unmount the disk with appbrowser open; if I start with the drive mounted, not only did I get the list but I can not even remove the disc
Before with the router I didn't have this problem (as you know now I use a usb serial modem), and now that I know escape it, that's not stopping me, but I wanted to report, even if it could be interesting.