user10401: I have come back to this site after a long time and I have noticed that I cannot cast close votes or reopen votes anymore. I noticed that it now says that this privilege can only be achieved once I get 3000 reputation points. What has happened? When did this change? Is this related to the site graduating.

user9943: After graduation 3k rep is needed by users to cast close and open votes. This used to be 500 rep before graduation.
See also Hello graduation, goodbye moderator privileges?

10401: <p>I have come back to this site after a long time and I have noticed that I cannot cast close votes or reopen votes anymore. I noticed that it now says that this privilege can only be achieved once I get 3000 reputation points. What has happened? When did this change? Is this related to the site graduating.</p>
 9943: <p>After graduation 3k rep is needed by users to cast close and open votes. This used to be 500 rep before graduation.</p>

<p>See also <a href="https://biology.meta.stackexchange.com/questions/3029/hello-graduation-goodbye-moderator-privileges">Hello graduation, goodbye moderator privileges?</a></p>
