Hi Chris,
I found that the package version for Ma Armored Code specified in the MCM for 1.1r1 (http://squeaksource.com/Magma/1.1r1.mcm) is 146, but the version specified in the magma wiki page (http://wiki.squeak.org/squeak/2657) is 147. I assume that the correct one is 147. If that is correct, then you need to generate a new mcm for 1.1r1.
Cheers