I'm not sure what happened - I was trying to zoom in on part of my story, and all of the sudden the passages started glitching up. I closed the Twine program and restarted, and what I see is this: link to screenshot
(The two stories with the huge red circles filling up the window)
When i open up the story, it is blank. But I can play it and it will run as if everything is still there.
Luckily I was able to import my last exported file and recover everything but I was wondering if anyone knows what causes this bug?
EDIT: Apparently it has something to do with holding down the alt key with the mouse wheel. Staying clear of that from now on.