What are you trying to setup to be exact?
It seems like you are just failing to simply keep dnsmasq and Adblock on - since you want ads blocked.
What option?
Try describing how you want the AP to work and how you want it to block ads.
Personally I just:
- Assign the LAN IP, mask, gateway and DNS servers to the subnet of my current router
- To use Adblock though, the AP would have to become my DNS server
- use DHCP on the AP and turn off DHCP on router; or
- configure router to use DHCP Option No. 6 to issue the AP as your DNS server