You're welcome.

Sorry,I don't currently have Chrome installed.The last I saw about Chrome and Immunization on here was that Chrome is not immunized,that a plugin would be needed to immunize it.Of course,that may have changed by now.Is Chrome listed when you click Show Details on the immunization page?
Yes,AVG is listed as a possible reason for incomplete immunization here:
http://forums.spybot.info/showthread.php?36272-Various-reasons-for-incomplete-immunization
However,I found a post from 2008 saying that immunization and AVG conflicting was no longer a problem:
http://forums.spybot.info/showthread.php?31643-Spybot-AVG-Free-8-0-Problems
Not a lot of other posts available to support that,though.I did have AVG myself quite a while back,and don't recall any problems with immunization though.
So,that might not be the immunization problem,though that's quite inconclusive at best.
Anyways,the problem with AVG and Spybot Immunization could not be fixed through Spybot settings.As I recall,what was happening was that AVG detected some of Spybot's immunizations as malware and removed them.So that fell more into a "Immunization incomplete" problem,and not really a 'making immunization freeze problem.'I believe.
Immunization can take quite a while the first time.Have you tried leaving it for a while?
Or does Spybot immediately become unresponsive when you try to immunize,or anything like that?