all i see is white - (greyed out) icon for any given image i look at with in any given folder
using a7ii
i have newest version of MAC on seperate drive - same problem
what am i doing wrong?
if i push space bar - opens some program that also does not work.. perfect photo or some such thing...
The newest version of MAC? What does that mean? New computer? Or do you mean new OS X (El Capitan being the latest 10.11.3)?
Raw files in OS X is handled as a part of the OS and if you have not kept up with the updates, you may need to simply bring your Mac up to date.
The other is to make sure you have sufficient RAM or it will really bog down while the OS is generating previews images for the file.
The other question is "...on a separate drive" What does that mean? Are you just saying that the OS is installed in an internal drive and your files are on an external drive?
As for sorting your files, I have a7Rii and the files are either 42Mb or 84Mb (compressed or uncompressed) and using the OS viewer, like suggested by a post is not an option for me. It is simply too slow to go from one file to another.
Having used ViewNX with NEF files, I get that you want to go through the images quickly and get rid of non-keepers and even rename them. What sw are you using to process the raw files? If you are using C1 or LR, then you can simply do that once imported into the file management portion of either of the sw. You can use Photo app as well for similar purposes.
That said, I use IJFR (Instant JPEG From Raw, just google ijfr and you find it) to extract embedded jpeg from raw files and use the OS previews to rapidly go through and ID keepers. I don't bother to rename files.