A minor suggestion that could have saved some frustration....
While autorouting the dialog box "Unreachable pad in Top Layer -- do you
want to continue?" showed up. I thought, "OK, I have some poorly-placed
restricts or something" and kept clicking OK thinking I would get past
this. A few minutes of clicking and:
a) I still kept getting the dialog
b) I had no idea what or where the problem was
Basically, this dialog is telling you something is wrong, but not why,
nor where.
It turns out I simply had set the Top Layer autoroute direction to "N/A".
Please make this dialog and error diagnostic more helpful!
Andrew