Гляньте
http://www.shutterstock.com/buzz/ от 14 мая, "What Our Improved Search System Means for Contributors". Предупреждают, что могут быть глюки с поиском и индексацией нового:
- This upgrade will fix a glitch that now causes some images to temporarily not appear in search results.
- There will be a slight delay for images to appear in the New sort order, but reliability will be greatly improved.
- During testing, different users may see different results for the same search.
- The order of images in search results may change. (However, the fundamental principles powering the New, Most Popular and Relevant sort orders are not changing.)
И что ж они там прикручивают, аж интересно стало )