The StatusBar in v8.40.12 of ControlsFX had a useful feature that no longer works in v8.40.12. In 8.40.12 when the progress was undefined, the progress bar cycled backward and forward to indicate to the user that something was happening. You can see this in the screenshot of the sample app for v8.40.12:
In version 8.40.13, this useful feature no longer works:
This was tested on Mac OS X with Oracle JDK 1.8.0_131.