Happened to me too.  This isn't the first time an update to named took my router down...

To fix it, I commented out the following lines:

dnssec-enable yes;
dnssec-validation yes;
dnssec-lookaside . trust-anchor dlv.isc.org.;

Since those are the ones that are looking for the missing files.  When I'm more awake in the morning, I'll see if I can get the dnssec working. 

I can't remember right now if I also modified the allow-query and listen-on lines also.  Might want to look at those if you are still having issues.

HTH

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Will Y.