That seems to have fixed it! I will post another comment if it doesn't. Thanks very much. :)
It's possible that your 'samples cache' has become corrupt. You can clear this out by right clicking the Start button and selecting Run and typing %temp%\PlayItSamples and clicking OK. Then clear out the contents of this folder. Then re-open the segue editor again.
Nope, still doing after a reconnect.
I had the same problem. I found out that my portable HDD where I keep all my audio was not connected. Once reconnected, my files are just fine.
^^ Addition to this
I have tried updating to the latest version. As I was on a couple releases behind.
When I am sege editing, some tracks dont load the visual audio levels. I have tried closing the segue editor, zooming in. And still doesnt show up. The track plays fine audio wise. Its not just this specific track, its multiple.
The only plugin I have is the "Now Playing" one.