The manual says it can film high speed movie in any shooting mode, and it worked the first couple days when I got my S8100.

In 1080P mode, it could shoot 10 seconds of high speed footage at 240FPS, and the HS mode is activated by pressing the "ok" button in the center of the rotary dial.

Not sure if I did something wrong, but now the high speed movie can only be shot in QVGA mode, and if I go back to the setting menu and choose 1080P again, high speed movie won't activate.

Has anyone experienced this problem?

I called the vendor where I got my camera from and they said I can send it back, but if they find nothing wrong with it, they'll ship the same unit back to me, so I want to try figure this out before shipping it back.