Firmware upgrade is not working on my machine

Since upgrading (J Rivers media centre 17.0.189) all the information on my media centre is streamd down to my tv. However despite the fact that all the music and photos are displayed, when I click on a photos it takes approx 30 secs to display, when I click on a music track the screen shows a green wheel and eventually it times out. Theefore no music is played.  How can I revert to the previous settings?