If the error code is "tempCOR" as I suspect, it's fixed in the update that rolls out today :)
The top-right bar isn't "gone" - you have to click the arrow on the top-left of the screen to drop the bar down and make it visible ;)
If you're in Act Three then you may have completed all the content to date. Check your leads. CK is updated weekly, with a new update out today, so I hope you enjoy!