disabled Approve / Reject / Improve buttons
Sometimes the approve/reject buttons are disabled in Suggested Edits. This may or may not have a reason (while the reasons mentioned in this thread don't cut it — only some posts are disabled and after I refresh, other posts are disabled), but it becomes more surprising when I click the post-link. If I click through on the "edit pending" or "edit (0)" link in the post, the buttons are enabled again.
Either this is a workaround to something I'm actually forbidden to do, in which case it may be a bug, or the disabled buttons weren't correct to begin with, especially when considering that for one and the same posts, they were enabled first, after refresh disabled and after refresh again enabled — etc.