Blitzz - only one computer sees Internet?

I've had to press into emergency service a Blitzz router. Using wired
only, with about 5 workstations on the network.

All workstations can interact with each other (so the switch is
working). However, only one computer (the one I'm typing this on!) can
actually reach the Internet.

This started when my Cisco router, and another switch took a lightning
hit earlier this afternoon. Both are toast, probably will never work
again (groan!)

Any ideas on what the heck is going on? Something in the Blitzz seems
to be blocking all the other computers from the Internet, but I can't
find it. Don't have any blocks or similar restrictions that I can find
in the Blitzz setup.

I do think it worked for a few minutes earlier this evening. Two
emails slipped through, but then things stopped working (again?) and
I'm getting nothing--in or out, on any of the other computers.