File Manager & Default Location Issues after migration

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I have migrated a site from my development server to a production server and am having some issues.

Once the site was up on the production server - the majority of the pages did not work. It seems like the page halts construction when reaching an image in the code that it cannot find. The result is the header and a blank page. Tracking down the image in the File Manager, it seems as if there are no issues (it rescans, downloads, previews, etc).

If I change the Default File Location, it breaks the connection to all the files in the File Manager. However, the pages all load just fine!! Some images have some display issues but the pages at least populate completely.

I can't figure it out, either I have a broken site or a broken file manager. My client is going to get very impatient if I can't figure this out soon. PLEASE HELP!!