Its does not happen when i test it. What is your cpu utilization?To be clear, BI crashes when playing with this feature enabled.
I would email support....Utilization is low 20%. It actually only happens on my two Amcrest cameras.
Just discovered a temporary work around for this problem. At least it worked for me. Open the .bvr file from windows File explorer. When it plays back in Blue Iris you can uncheck the "Test run video through motion detector". I can now play videos in BI as long as I don't check the test option.
Edit: you can check and uncheck the "Test" option while playing back from File Explorer, But not from BI initiated playback. It will fail as soon as you check the test option from BI initiated playback.
4.3.0.9 seems to have fixed it for me. Thanks to those who let Ken know.