Text doesn't show up in PS7

Okay, I have this problem with photoshop 7. This problem came up just yesterday, I writing a text with photoshop etc. But then, when I started a new text, no letters came up. I've tried different text sizes (biggest as possible, and smallest), zooming, different fonts and stuff, but I still can't see any text. I can see what I've wrote in the layer title, but nothing happens in actual image. You know what it could be, and how I could fix it? :o

Here's a screencap too.