I've seen this happen more frequently. Forum Spy sometimes skips updating for a while, even though threads should be showing up. In the example posted below, a thread was started at 5:52 with a response at 5:53. Neither showed up on Forum Spy, even though they were in an included forum. Logging out, deleting all cookies and logging back in a few times will cause those threads to show up, but then other threads are missing. It's simply not reflecting all posts as it should.