After updating to 5.1.6 all my portfolios have the same thumbnail image, since I used one filename for all portfolio avatars (avatar.jpg). Thumbnail is now stored in "/wp-content/themes/striking/cache/images/avatar-217x150.jpg". When was this changed? I have to manually now add new avatars with different filenames to all of my ~100 portfolio items...
My uploads are yes, in separate folders (month/date). I already cleared the cache but that didn't help and timthumbs have been off all the time. So no solution yet.