I'm on the Envato sites nearly every single day.
Today, I hop on the site and find a couple items to buy and now there are no buy buttons or a way to add to cart. Huh?
No new updates on my computer, on a Mac using the latest Safari browser. Nothing different from yesterday on my end.
Here is a screenshot of a Themeforest page:
No buy button.
I'm sure this isn't happening to everyone, but I can't imagine I'm the only one.
Envato, you might want to look at this issue.