Video in slideshow not fullscreen

[supracom]

Hello,

We are using XNView to present numerous pictures and video's in 1 slideshow.

In the slideshow preferences, I've activated every option for stretching fullscreen video's but they just won't go fullscreen. The video doesn't go fullscreen in the preview mode either. All pictures work fine.

The video is a 720p MP4 video that I'm trying to show on a 1080p monitor.

Any suggestions and help is much appreciated.

[xnview]

If i use 'stretch small video', the played video are fullscreen...
Do you have tried with an avi?