Video exported with Pinnacle 16 presents problem , image plays normally until reaching 8 seconds then it freezes , audio plays normally

I imported an .avi movie , 01h:30 minutes large, with the purpose to select a footage that interestests me and to export it.
I employed the razor split clips tool to get precision in editing , checked this new video by playing with Pinnacle , which played perfectly and finally exported.
The exported video plays until reaching 8 seconds , it is when the image freezes and audio plays up to the end.
I dont use Pinnacle that much , but the times I did the procedure as written above I had no trouble.
I ask you whats wrong ? Thank you very much.