Today, I came across a diff in the RCPatrol App, which caused the “Mark as patrolled” button to freeze each time I came upon it. http://www.wikihow.com/Perform-an-Appropriate--“Rock-Sit”?title=Perform-an-Appropriate--“Rock-Sit”&curid=1383296&diff=6000558&oldid=6000554&rcid=6477927&reverse=&featured= is the diff… It seems it has a problem with the title. I clicked “View Diff” to get the diff and mark it as patrolled, however I received this error bringing my attention to the title: The requested page title was invalid, empty, or an incorrectly linked inter-language or inter-wiki title. It may contain one or more characters which cannot be used in titles. If it cannot be used in titles, why does the article have that name?:slight_smile:

It looks like this article was deleted on 5/26. Were you patrolling backwards? Maybe you came across a diff on an article that had already been deleted?