Windows 10. I skipped 9.1.4.0 and just now updated from 9.1.3.0 to 9.1.5.0.
Following the update, I was doing a lot of work in RM where I used the Index sidebar a great deal, moving around and looking a lot of people. The result was a 217 Argument Out Range error. This kind of activity has been a common and not totally repeatable way to create the 217 error. I just wanted to report that the error still seems to be there after the 2.1.5.0 upgrade.