I came across a weird question... The thing is, suddenly without and reasons, I could only pdfTeXify one file in my WinEdt. As you know, we usually open lots of files which we have edited historically in the WinEdt, and we can just latex any one as we like. However, I could only latex one now (the first opened one), and if I want to latex others, I have to close all the other latex file except the one I want to debug. I really have no idea why, and this bugs me a lot since it's really inconvenient.
Could anyone please help me?