I found that the desktop app balked and timed out trying to connect to the SMS function the first time I tried it, but the second time I tried it, the function connected properly and has since.
BTW, they've released another version of the desktop app, make sure you have the latest, 3.0.1 (a curious version number for an initial release).
BTW, they've released another version of the desktop app, make sure you have the latest, 3.0.1 (a curious version number for an initial release).