Upsource message "It's broken!"

How can i remove the message "It's broken" or what is the cause?

Description
After opening Upsource i get an message in right bottom corner without any additional information or hint.

Logs
Maximum log level in complete log folder is "INFO".

Browser console
JS console writes a lot of stuff on level Logs. Looks like a request list. One canceled red request.
"Cancel request #23, subscribeFeedEvents, 446 bytes"

All other output comes from console.dir... in
frontend-0.js:2325:303
frontend-0.js:2325:275

Browser network tab
Only return code 200 (except oauth 302 and 101 for the web socket). Socket messages has no error or It's broken content.

Error
"It's broken!"

Screenshot

Browser:

Firefox Nightly 69 (happened also in 68 67....) and Chromium

Upsource
Up2dateBuild 2018.2.1291 - but also previous versions had the problem.

Additionally:
I tried to search the error and fix it, but i found nothing via search or specific Jetbrains documentation (especially troubleshooting - often a good help), knowledge base or community.

Notice
One Project (fully indexed and ready) has gray instead of blue bars.

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