Errors in XS labeling tool

I am using SS2.615 and labeler is working erratically.  Sometimes it will label the text id sometimes it won't.  Rerunning the labeler and its still not labeling the same label.  Copies of this text element have been placed multiple times with some working and some not.  There doesn't seem to be a specific set of circumstances to get it to fail.  I have run this on version .423 and on a seperate machine with .615, both with the same issues.