My Windows 'pop-ups' when I receive a slack message have started (maybe in the last few days / weeks?) to have escape characters in them. e.g. '
When I view the message in Slack (web, or desktop App) it's fine; just the Pop-up.
It's happening with my colleagues too, so it's not specific to my machine.
Is there anyway we can fix this?
If you switch to using the built-in Slack notifications (Preferences -> Notifications -> Deliver notifications via... -> Slack's built-in notifications) then the Slack notifications will show up properly.
The problem is that Slack messages are HTML encoded under the hood and Windows notifications don't render as HTML, they just show the plain text. The downside of this is that now your Slack notifications will now overlap with the Windows notification popups.
Slack customer support have contacted me to assert that this is now resolved; haven't tested it myself since I'm using @sam2929's solution.