I downloaded Capture One's Sony Express software to try on my A7. I can generate Tiffs from it with no problem. These are 16 bit Tiffs in Adobe RGB colour space. They open happily in Photoshop and in Mac Preview and seem perfectly normal tiff files, but I cannot import them into Lightroom. If I try to do so I get the normal import screen with the photos shown. I make sure that they are all checked and then click on the import button. I get a bar in the top left of the LR screen saying that it is importing files from their original location but no photos are imported and LR hangs. If I then cancel the import task from the top left bar by clicking on the red x, the import options are greyed out from the File menu.
If I then save one of the tiffs in Photoshop under a different name (i.e. DSC0xxx-2.tif) then that imports without a problem.
I am still running LR 4.4 on Mac OSX 10.9.5.
Clearly it would appear that there is something odd about the tiff files exported by Capture 1. Same problem if I export from Capture 1 as an 8 bit tiff.
Anyone got any ideas or suggestions?