currently there's an issue with the dropdown menu "Do you see this problem in a prior version?"
as soon as you select the Answer "Yes, tested in prior version" a script request an option to be set and the SR-owner is unable to log the request.
the only option/field that this could refer should be the Version-field (has been edited).
I tested this issue in Firefox and Chrome - both are telling me exactly the same error message.
my Workaround: I selected "I am not reporting a problem" and placed a note in the text, that the previous release is affected.
here's a copy of the error message (Google Chrome):