Are you sure you have selected all photos in the Collection grid view? [Ctrl+A]
Is it possible the collection only has one raw image? The others may be virtual copies.
(I had no trouble converting all files in a mixed collection of CR2 and ARW files. CC2015.10)
And is it really important to you to convert to DNG?
i will try grid view.....i used LR since 1.0 and have always converted DNG....part of my work flow.
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First get out of any collection you are in. Second go to the Grid view. Third select All Photographs in the Catalog section of the left hand panel.
Use the filter bar to Filter in, Show, only CR2 files (Last column on the filter bar with Metadata selected) and change the heading of that last column to File Type then select Raw from the list. Only CR2 files show then show in the Grid view area. Select All and then convert to DNG.
YES, and a big thank you to everyone...grid view did the job and I was able to convert the collection at once in progress now.....@ WOBERTC-So the reason for this so I will remember is in grid view I am not looking at any virtual copies ( I always work in individual mode so possibly it was only acting on one image globally)... Well I am glad you guys are here!!! cheers V.