For some reasons, at random times (yet never long enough to let me work 5 minutes in a row), REAPER just freezes up and I have to kill it.
When I change my sound driver from default, however, this does not occur. This is good, except for the fact that I have no idea how to set up the input and outputs afterward so that I can hear what I'm doing on REAPER. I think I probably have to mess with QjackCtl, but what should I do?