Jemmy B,
Did you figure out how to fine your open vectors?
If not, here is what I have found. First, I'm using Aspire and it may be a little different.
When closing or joining vectors that eventually form a loop, you have to do one last join to close the loop. See, it will look like it is closed but the last join isn't really there.
If your software has the function to display all open vectors, you will see them even though they appear to be closed. Just click on them and do one more join.
Hope this helps.