I assume the problem that is happening is this problem in the link below, but the problem could also be that older Network / Multisite .htaccess code is being used.
Image file paths are…
welca.milwaukeesynod.org/files/2012/01/welcalogo.png
ofh.milwaukeesynod.org/files/2012/01/o4hlogo.png
…on these Network / Multisite subdomain sites so since /files/ is shown in the URL path to image files that would indicate that this site was first installed using WordPress 3.4.2 or below. New Network / Multisite sites installed using WordPress 3.5 or above will show /uploads/ instead of /files/ in the image file URL path. But if this site was first installed with WordPress 3.5 or above then that could be the problem since the .htaccess code has changed for WordPress Network / Multisite sites as of WordPress 3.5 and the image file URL path will be incorrectly rewritten in the older .htaccess rewrite code.
New WordPress Network / Multisite .htaccess code based on WordPress version
http://codex.wordpress.org/Multisite_Network_Administration#.htaccess_and_Mod_Rewrite
What type of Network / Multisite installation is this? sudirectory or subdomain?
What version of WordPress did you first install this Network / Multisite site? WordPress 3.4.2 or below or 3.5 or above version?
How are the subdomains created? Using a plugin, using A or CNAME DNS records? Are you using a domain mapping plugin?
BPS Pro 8.0 is scheduled for release later today and the Primary focuses are Network / Multisite Network Activation or single site activation for BPS Pro and new AutoMagic code for Network / Multisite sites based on WordPress version installation – WordPress 3.4.2 or below or 3.5 and above.
http://forum.ait-pro.com/forums/topic/network-multisite-read-me-first/
Once you have answered the questions above I can then tell you what needs to happen next.