Hey there,
We use MultiSelect2Filter on a resource in admin package. It works ok and you can select options in it. But when you remove one option from the selection the whole filter box gets hidden (FilterBox div loses class "show"). This is not good, as you can have many options and you want to do things and hit "apply" before the box gets hidden.
If you can please let us know where to fix this bug (as I understand bug release might come in the future).
Thank you!