Shouldn't be any frames at all. Your screenshot was from the live site, a separate issue i'm on hold with GoDaddy about. (the domain has been set to forward with masking here for a few years and i'm using it for the overhaul.. DNS and site forwarding are all setup proper but still having issues - basically GoDaddy is fighting with itself as to where it wants to point this domain)
Test Site
Setup: new hosting, WP multisite at the root directory. Using subdirectories, not subdomains. No plugins at the moment. Nothing fancy going on. The themes are complicated, but that's not going to affect the wp-admin area.
I could always do a str_replace in the theme to fix the url but that's a hack and not a solution..