I got this problem today too. I usually have update paused but I had let it update yesterday and now today Cakewalk stalls on opening. I did a restore and it opened but no sound, did the repair and that didn't fix it. Then I came here and saw Noel's download fix and that seems to have done it. Hope it lasts.
@Wookiee, @treesha, @jack c. , @Kevin Walsh Thanks so much for the nice comments.
Kevin, the Fishman midi guitar system is a must for a complete non piano player like me. It takes me forever to figure out the piano chords from my guitar chords.