Custom Visual constantly "refreshing"

[mpo]

I am trying to develop a custom visual, and what I have so far is constantly "refreshing"/"processing" - there's a spinning animation in the top left corner:

How would I go about troubleshooting this?

I don't have a PowerBI account, so am stuck with PowerBI Desktop as the only option and cannot use browser developer tools to debug.

Thanks in advance.

[Mcburn · Accepted solution]

I got that processing when i build a infinite loop or i process to much Data.

Sometimes it is a Format Failure when my Color Selector or my Capabilites are set up wrong.

The problem is, even with debug mode i can not really debug this.