I'm exporting to a temporary folder on my desktop and from there, editing in DXO Photolab 6. I don't use 'Open In' as this sends in TIFF and I of course, want to start in RAW. The shortcut worked this morning once, then stopped. The only other point is the photo library resides on a 2Tb Thunderbolt drive and I can see from the light on it and Activity Monitor, that it is working a lot of the time. Curiously, the Export shortcut Command Shift E works fine and my revised shortcut Command Option E now shows up in the same box but only works occasionally. I'm using a standard Apple Bluetooth keyboard and tried it also connected via USB - still no luck. All the keys work correctly so something is amiss. Thanks again for your helpful feedback and suggestions