I'm using the stroke effect so that text appears to draw on. The effects used to play back just fine, but now, one by one, the stroke effect has stopped playing back. The text just appears with a straight cut, even though the stroke effect has been applied and used to work just fine.
More details: What version of AE? What system? What setting in teh comp, the effect and so on? What else is involved? The magic is all in the details...
You could be using Stroke in about 10 different ways to reveal the text. I don't have tome to give you 10 answers so please give us a screen shot or some more details about your project.