Bluetooth does not work for MKV?

Version Infuse Pro v3.2.2
File type: MKV
Device: iPad Air

Obviously I get sound over the speakers. I also get sound via headphones plugged in.

With Bluetooth, if the file type is an MP4, I get sound; however, with MKV I cannot seem to get bluetooth to work.

Audio track is listed as Dolbe Digital Plus.

Is this possible over bluetooth?

Okay, go figure … it is working today.

One difference is that I had the bluetooth headset active prior to starting Infuse. Today, I had Infuse running first.