We are using SM V12.4. Multiple users have reported the same issue, and I've verified it happening on the Admin account as well.

 

When using the quick-search (at the top of the Inbox page), or the advanced search (it's own tab...), no results later than 8/4/15 are returned, regardless of search terms. I've tested with terms copy/pasted out of an email sent earlier today. When you just open the inbox, the email is there. When you apply the search filter, nothing after 8/4/15 is shown. 

 

 Unsure how to proceed. Anyone else run in to this?