1. If a question is off topic, then it is off topic. It matters not whether it was on topic at the time of asking. So, Yes, do vote to close.

2. Don’t go out of your way to look for problems, unless they’re the kind of problems you can fix yourself.

   • Do your best to fix any problem you see
     • on the front page,
     • in review queues,
     • in your normal browsing of the site.
   • You can go looking for other problems, such as misspelled words, duplicate questions, and suchlike, if that gives you pleasure and if you have sufficient rep to deal with such problems unilaterally, without taking up anyone else’s time.
   • If your edits or close votes need approval from other people, don’t go looking for problems, but still do your best to fix them when you come across them.

1. If a question is off topic, then it is off topic. It matters not whether it was on topic at the time of asking. So, Yes, do vote to close.

2. Don’t go out of your way to look for problems, unless they’re the kind of problems you can fix yourself.

   • Do your best to fix any problem you see
     • on the front page,
     • in review queues,
     • in your normal browsing of the site.
   • You can go looking for other problems, such as misspelled words, duplicate questions, and suchlike, if that gives you pleasure and if you have sufficient rep to deal with such problems unilaterally, without taking up anyone else’s time.
   • If your edits or close votes need approval from other people, don’t go looking for problems, but still do your best to fix them when you come across them.

More detail.