Very low resolution previews using loupe in import dialog

Hi,
I had connected Canon 6D via usb to import photos to Lr. However in import dialog using loupe view I get very low resolution previews even if I zoom all way up. It doesn't make any changes in preview resolution, it's like 200x300 pixels at most. I shoot both raw and jpeg and it is the same. Tried full card format. Doesn't help. I can zoom normaly in camera screen. Is it related to the fact that I connected camera directly via usb instead of using card reader? I use latest Lr (5.6) and latest camera firmware (1.1.4).

A raw file usually has two previews embedded in it, a tiny thumbnail preview and a larger zoomable preview. It sounds like LR is only able to retrieve the tiny thumbnail preview even though you are able to zoom in on previews in the camera. Unless the camera, itself, is actually decoding the raw file to produce the zoomable preview and none is in the raw file for LR to see.
You can use the following website to investigate what previews are available in a raw file: http://regex.info/exif.cgi You want to click the Browse button next to Local Image File and navigate to a raw file and click Ok, then click the View Image From File button, then wait for the raw file to be uploaded, after which information about the raw file will be shown including the sizes of the previews and raw image.
As to your question about whether using a card reader might help, try it and see. There could be a system driver getting in the way when the camera, itself, is plugged in.

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