I did have an odd issue last night though on this very same clip at 240FPS that I got working.
Without a single change, the file seemed to self destruct. I was looking at the clip on the timeline, it was playing fine, then suddenly changed to those colored bars.
The clip was still in the bin, yet the file size reduced to 149KB. I went to my directory, same thing. File was completely screwed. I have no idea what happened so I downloaded again from my SD card and it works again.
No explanation on this one.
Eric