I'm using the most recent LR 2015.1 and as of the most recent update, I have been unable to set my default file Renaming option during import. Whether I select it during Import > File Renaming > Rename Files > Template: My Option OR File > Auto Import > Auto Import Settings > File Naming: My Option... my choice doesn't stick. I can use it that one time, but next time I Import it reverts to another option.
What am I doing wrong, or is there a glitch.
Thanks for your time,
Would you please try resetting Lightroom preferences by following the below steps: