Maybe a simple resource issue stressing out your 'puter.
Try recreating the guide in Premiere Titler as a title.
Set a Safe Title /Safe Action area to match what you want to see. No resources involved in that.
Thanks, didnt think to try it as a title. Worked much better
Safe areas might be even better option because they will also display in Titler.
thanks, tried safe areas but went with a title. A little more customisable, I could make it a red line on top and bottom only.