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The current version of Media Viewer on alpha sometimes shows only thumbnails instead of full images after you have clicked on arrow keys a couple times.

http://multimedia-alpha.wmflabs.org/wiki/Lightbox_demo

I am not exactly sure what causes this behavior, but it happens pretty regularly for me now on this version.

I mean, we're always showing thumbnails, but sometimes we show smaller thumbnails than expected.

bug 56454 possibly related

I think this should be fixed "for good" by my ongoing work on https://wikimedia.mingle.thoughtworks.com/projects/multimedia/cards/146 which cleans up the logic regarding the thumbnail placeholder

Haven't seen this for a long time.