Images Won't Load Unless I refresh

My site is just about finished but the one thing that is keeping me from turning it over to the client is the problem I have had with images loading - or I should say not loading. On every page, the header image and most other images don't load unless I refresh the browser several times. I have spoken with my hosting CS and they tell me I need to look at how the theme is loading. Can you give me advice on this? The images are optimized and it's not a size issue. That's all I can tell you so far... I appreciate your help:slight_smile: JOinAZ