Confirmed: Rolled Chromebit back to R59 and re-enrolled. Chrome Sign Builder loaded right up.

Something broke Sign Builder between 59 and 60.

I tried reproducing the problem on a device with ChromeOS 60 and so far don't observe the issues you have. 

Would you mind sending us the application configuration (schedule) you are trying to use (if you prefer you can also email it to me instead of uploading it here). 

Have you tried configuring a different schedule instead of the one that fails?

Also please share whether the option to let the app to manage the power settings of the device is turned on or off in the admin panel for this OU.

Schedule is attached. I did try removing the schedule and reapplying it, no change.

The app is allowed to manage power. (Kiosk app, installed automatically, automatic launch, etc)

Deleted: hs-csb-schedule.txt 810 bytes

hs-csb-schedule.txt 810 bytes View Download

Thanks for sharing the schedule. I noticed that you have the URL for the presentation entered twice - once as a background url and once as a scheduled item (6am to 7pm ET?). The scheduled item url is correct while the background url seems to be malformed (results in a document not found error). Otherwise the schedule works on my test device. I am trying to get hold of a Chromebit to test with it if it is a local issue to this particular device. 

Meanwhile please try the schedule attached to this post and let us know if it works for you. You should see http://example.com loaded when it is active.

Deleted: sample-schedule.txt 176 bytes

sample-schedule.txt 176 bytes View Download

That seems to have fixed the schedule, yes. Thank you for noticing that! 

I'm not very keen to update a Chromebit back to R60 to see if it will break or not, as I have no spares and these are all production units at the moment.

Marking this as WontFix for now since the problem is not reproducible. Please comment here if further investigation is needed.