Not sure what caused it after all the fiddling about but every thing seems to be working. Thanks everybody for your help regards Ian

Could be the rendering problem The I have? regards Ian 

acsscott, I am set to Intel now, it was something else when I checked it. Will try lowering from 100 to 50 and see what happens regads Ian 

100 was the setting when I first used PS 21. I have never switched off my AV, but could try for a test. not sure about the quality question....think mine is set to best regads Ian 

 acsscott Same as me, I found it easy on previous versions of Pinnacle, but I have managed to get it working on Pinnacle 21. I just highlight the section of the video I want to pan/zoom, open pan & zoom in editor, make sure I get the picture and the red marker at the beginning of the section, click on the white marker along the ...

Tony P optimization is on 100% render settings on AUTO video source windows media, VBR quality resolution HD1280X720/25p antivirus still on nothing running in background ruler zooming ON  Montage scaling CROP regards Ian

I will answer your questions tomorrow, but the basis for my problems seems to be the use of pan and zoom. If not useing P&Z I don't seem to have problems. Ian 

I did try to find how to check RAM use, which I posted to acsscot earlier after he showed me the method......but I may have missed something? Ian 

acsscott  Am running the latest version of windows 10 home. Ian 

With Pinnacle open, but not in use:- CPU 4% MEMORY 33% With Pinnacle running in RENDER   CPU 55% MEMORY 59% Regards Ian