If you have troubles since the update to WordPress 4.5 please read this post before opening a new thread.
I have added color images to my slider and they are now greyscale, the thumbnails are color though.
Try to re-upload the images.
I will tag the rest of the support team.
I produce the same slider that you have and it works fine without creating greyscale images.
Do you have any plugins running? Please deactivate those then re upload the images. Let us know if the same thing happens.
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