If you didn't already know that is. This version has many new features including data migration, IPS signature updates, ASA 7.2...http://www.cisco.com/en/US/products/ps6241/prod_release_notes_list.htmlhttp://blog.priveonlabs.com/
If you don't feel like re-installing all of your agents when you run into this bug go through are remove the references to the @systemX86 in your (220) variables. Should take care of the issue until you can get them upgraded.
Hey Ward.Load 4.3.2 on to see if that resolves your issue. There is a bug (CSCsk44951:IOSIPS not working under IOS 12.4, unless that is your bug) and also 12.3 and 12.4 are now supported in MARS. It might just be part of your problem.Cheers,Brad