I am sorry to say that I can confirm that this is a problem for FontLab Studio 5.1.5 I'm going to go write a blog post right now and publicize it.
I had not heard any other reports, but then again, lots of people don't upgrade instantly to the new version. Our preliminary testing didn't spot such a problem, but this was not immediately obvious without doing that particular operation.
I had a huge decrease in back trouble after I got on Aeron chair at home. I actually have two now, one in my office and one in the dining room. Best equipment investment I've ever made. Before that I had occasional debilitating back issues. Not since!