Hanna, my newbie shoulder separation still gives me near daily pain and stiffness fifteen years later and I suspect I'm not unique...it is a pretty common newbie aikido injury during learning forward rolls and I sure wouldnt have minded learning a different way.
Oh. That's bad. Are there many other stories like this?
Would you say the problem was the type of roll you were taught, or rather the pedagogic metods used how you were taught?
Most of the stories I've heard of people injuring themselves in rolls were young cocky guys competing how many people they could jump and roll over. They didn't have the skill for it, obviously, tried and failed.