Android Question B4XPages Indeterminate Progress Hangs on Faded Black Background

Hi, I'm using indeterminate progress bar in B4XPages. Sometimes the app just hangs on the faded black background. The progress bar itself is hiding when its function to hide, but the faded background remains.

I'm using this library: MaterialDialogs

Is this library is compatible with B4xPages or I need to use another library?

The default progress dialog hides when the app is minimized so that I'm using another library.

Any suggestions for this? Thanks...