Is there a way to get 0.107 working with clients
compiled against
older versions of jack?
Failing that, would I be able to get all these apps to work again
against the new version of jack if I simply build my own packages
from source debs, or would I run into further trouble?
yes start a jack client that is not working from the command line see what
version of jack it is trying to connect to find that file
libjack-[something].so and remove it - replace it with a symlink to version
you just installed.
Its a dirty hack but it seems to work often enough.