I have LR 5.5 (just upgraded a few days ago).
I was choosing which of my daughter's graduation pictures to keep...I marked the ones to delete with a rating of 1.
I them filtered on rating=1 and selected the pictures and said to delete from catalog and disk.
When that was done....ALL of my daughters pictures from that day were gone from the catalog.
I checked the recycle bin and the ones I selected to delete were there.... however the pictures that I did not select to delete were not in catalog.
they WERE on disk ...but even though I selected all pictures with no filtering the good pictures would NOT show up.
I was freaking out.
I closed LR5.5 and when I relaunched the pictures were there....
THIS IS A BUG and an ugly one at that.....
Adobe PLEASE FIX !!!
also...is there any log files to review what files Lightroom deleted or did things to ?