Could you take a look at the HTML of the content areas where you have images in the back-ends radeditor. Does it have an attribute called sfref=(some guid). This means that images were properly inserted using the image editor and not via direct link.
You can perhaps also check the workflowbaseurl setting which is under Administration->Settings->Advanced->System->Servicepaths and see if it is set to something different then blank or your site name.
Basically there could be a few things that are going on there - images being inserted through direct link, some issue with publishing or rendering, but it will be best to take a look at the project or at least get a close idea over some characteristic of the images that are not showing vs. the ones that there are.
What would be best is if you can submit an additional ticket with the urls and access credentials so that we can take a look and see if we can debug the issue further.