Problems with Domain Mapping and SSL

I have a multisite installation for four websites. The first three (www.acswa.org, students.acswa.org and va.acswa.org) were all there first and working fine. I added abe.acswa.org and used the Domain Mapping plugin to point abecsw.org to abe.acswa.org.

Abecsw.org is working fine - but now there is a mysterious 302 redirect on the main domain (www.acswa.org) and any form that requires SSL on that domain or it's subdomains goes into a perpectual redirect from SSL to non-SSL causing the forms not to work.

URL for pages with forms - https://acswa.org/join, https://students.acwa.org/join and https://va.acswa.org/membership