Pi Hole worked for a while, not it's not

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Your debug log shows that your Pi-Hole is listening on the eth0 interface at the address below.

*** [ DIAGNOSING ]: Networking
[✓] IPv4 address(es) bound to the eth0 interface:
   192.168.1.18/24 matches the IP found in /etc/pihole/setupVars.conf

But, further down in the debug log you see that your gravity list is empty. This corresponds with your screen shot showing "Blckng: 0 domains".

*** [ DIAGNOSING ]: Gravity list
-rw-r--r-- 1 root root 0 Nov 24 04:50 /etc/pihole/gravity.list
   -----head of gravity.list------

   -----tail of gravity.list------

The solution is to update gravity - from the terminal pihole -g or from web admin interface (tools > update gravity). This will reload your subscribed block lists and populate the gravity list. With your subscribed blocklists, you should see about 137K domains blocked.