Hi Patricia Burke
It looks to me as if you haven't also updated MultiTerm to the latest version?
Though in the past, older versions of MultiTerm would often work fine with Studio, in fact with this version something changed in how they were compiled to interact together (not sure if that's the correct jargon). So, it has to be the correct version of MultiTerm for the version of Studio or it won't work properly.
Open MultiTerm and allow it to update if you haven't already.
Hopefully that's all this is...
All the best,