Was working on Win2K/Xitami - now blank pages?

Hi all, Well, I actually have been able to get PHP installed and running under Win 98/Xitami and I once had it working under W2K/Xitami. Unfortunately, I now have a problem with the W2K setup. I edited & placed the .ini file and added the necessary filter to Xitami and two days ago it seemed to running great. I was able to see the results of a couple of test files. Then yesterday I brought the box up and when I try to access .php3 pages I just get blank pages. A look at the code shows proper headers & footers, but nothing between the body tags. I'm completely at a loss since I don't think I did anything to the setup between the other day & yesterday. In an effort to fix the problem, I've replaced the php.exe file with a fresh copy. I even tried placing php4ts.dll & msvcrt.dll in the WINNT root, which I hadn't had to do before and I'm still getting blank pages. I hope this is just something dumb and obvious to those of you in the know. Thanks for any help! Lisa