Option to lock segments grayed out 2017

Is this a setting that my client chose when creating the sdlxliff or does it point to some problem?

I need to be able to lock segments in order to enable auto-propagation but not auto-propagate changes to ALL segments. I normally lock these to prevent further edits.

I also normally use ctlr+shift+U (add new translation) to prevent creating 100% matches for some content, but that does not work for segments that are marked for auto-propagation.

Looking forward to some suggestions. 
Thanks.