Down for me. Using the browser.
Browser fails with the same message: Something’s gone awry and we’re having trouble loading your workspace. Sorry we can’t be more specific – this is one of those cases where we don’t know what’s gone wrong either. A restart of Slack might help, and you can always contact us. ps. restart of slack in browser? wtf?
most people IME use the slack app, in which case "restart" makes sense.