Thanks for the reply. I've been reviewing the docs for both the qmultiselector and the qselector since as I understand qmulti is built off of the regular qselector and I've been using the "refresh when change" option.
As it relates to your example. I assume that within the languages list each language item can have multiple country IDs associated it to it, is that correct? That seems to be where I have problems. As long as my relationship is 1-to-1 I have no issue with selector one fitering selector two, but as soon as I create a 1-to-many relationship in the second list (languages) the filter doesn't seem to work. Does that make sense?