Dave,
Glad to know I am not the only one.
For me, I've disabled K2 login as an option. So login is through JomSocial or Joomla.
Now, I've just notice that if I add a new blog in MyBlog from JomSocial, then those two fields disappear.
I hope we can get some help in fixing this problem. If not, I have to look at some other alternative, which is a shame. I do like the K2 component and wish didn't have this problem.
Michael