If you have troubles since the update to WordPress 4.5 please read this post before opening a new thread.
I use within my portfolio item the version with Gallery (like in the demo theme here).
I use the plugin “Simple Image Size” to add my own size for the little thumbnails below the big image, it’s a size of 118×58 px JPG and yes, I regenerated the thumbnails:
When I open the thumbnail in a new browser window, then it is really sharp and not blurry.
But the same size within the gallery is blurry. Is somewhere a compression or what could cause this?
See the comparison at its real size here:
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