Last modified: 2014-08-19 21:14:21 UTC
This shows: http://upload.beta.wmflabs.org/wikipedia/en/thumb/4/4d/Snowman.JPG/120px-Snowman.JPG This doesn't: http://upload.beta.wmflabs.org/wikipedia/en/thumb/4/4d/Snowman.JPG/qlow-120px-Snowman.JPG These images are supposed to be auto-generated by the thumb.php, could it be out of date?
I think that is handled by deployment-upload.eqiad.wmflabs which is more or less a simulation of the old media servers using nginx. IIRC thumb.php got copied there a while ago and never got updated.