Chatapp Slack has problems sending and receiving messages. The company itself will let you know on the status page. It is unknown what caused and when the problems were resolved – some users cannot log in, while others have problems with Slack’s speed and sending or receiving messages, the company said. The problems have been going on for about 4 p.m. on Monday afternoon. Slack does not provide a cause or forecast when it will be resolved. The chat app is not down: users report that many messages also get through and that the app continues to work for them. Failure site AlleStoringen shows a peak of reports about Slack since Monday afternoon.