Capturing an image failed because the operation timed out.

I have a Nikon D3300 connected to a MacBook Air running Sierra and istop 3.8.2 (trial version). I have the camera setup in manual mode, small file size and connected via USB. When I click on the “Still Camera Preview” button, the camera fires, but after a wait of a good too many seconds, I receive the message “Capturing an image failed because the operation timed out.”

In istopmotion, I selected “Ignore Whitelisting for Digital Still Cameras” (found this advice in a different discussion) but still nothing.

Any suggestions or advice?

Warren