This did seem weird that the user was able to double click the thumb and go into darkroom to edit but not seemingly able to select an image in the lighttable and do a copy and paste. I noticed last night that simply hovering over an image enabled the option selection buttons in the history operations pane of lighttable and then when you move off it they grey out. I wonder if this was confusing the user into thinking that he had selected it but then it didn’t remain selected?? However one would assume that you would be aware if you had actually clicked on the thumb for selection or not vs hovering but I guess you should never assume anything and your point is for sure well taken. It is amazing when someone takes the time to really describe the problem in detail it can usually be solved quickly…