It is a good idea to keep updated with the Announcement Topics…
It appears you are using the Cloud Server… but still, there have been some port changes. For the App, particularly with Local Server (9443) but also for the devices (moving to port 8080)… that might be the cause of your issue?
Also, have you reflashed your device with the new library? Just updating your IDE isn’t enough 
And on that note, when updating after a long time, it is best to completely remove the old libraries BEFORE installing the new ones MANUALLY (AKA, don’t use the IDE Library manager)
If nothing in all that seems to help (unlikely) then post your code here… properly formatted as required in the directions…